Forms 2nd grade math addition with memory It is an important part of a child’s elementary math curriculum. Understanding this, Trường THPT Trần Hưng Đạo has synthesized 5 common math types and the most detailed solutions. This is to make it easier for parents to review math at home for their children.
The concept of math addition with memory grade 2
Before learning about the knowledge surrounding problems about addition and subtraction remembering grade 2then let’s review with Trường THPT Trần Hưng Đạo the definition of addition as well as the elements inside it.
Addition and elements to grasp
Addition is usually written with the plus symbol . “+” is one of the four basic operations of arithmetic, including: Summation, Subtraction, multiplication and division. The result of the addition of natural numbers is the sum of those numbers.
In addition, we need to pay attention to two important elements: term and sumis shown as shown below:
The concept of units, tens, hundreds
To be able to easily solve 2nd grade math forms Memory addition within 100then children need to understand the concepts of unit class (including: units, tens, hundreds). More specifically, you can guide your child through the following examples:
The concept of the addition of 2 digits with memory in elementary mathematics
In elementary mathematics, memorized additions are additions that When adding the terms in a certain row, the result is greater than 10.
This is also the most basic way to add multi-digit numbers. Specifically, the implementation would be to sort the terms vertically and add column by column starting from the units column on the right. If a column is greater than or equal to 10, the remaining digit is “remembered” to the next column.
For example, calculate the sum of 12 plus 88 below:
How to solve common math problems in grade 2 with memory
There are many ways to teach math addition with memory in grade 2, the easiest is for children to do various types of exercises. Here is how to solve the most common problem types in the program or 2nd grade exam questions.
Form 1: Mental calculation
Practical exercise 1: Mental calculation
Solution Instructions: First we need to look at the terms in the calculation to see if there is anything special about it. For example, all have zero units, or tens and zeros, and so on. Then we can do the addition as usual.
Eg: 20 + 30 + 40 = ?
Comment: We can easily see that the units of all three numbers in this calculation are zero, so we only need to care about the tens digits.
We have: 2 + 3 + 4 = 9, write 9. Then, write 0 after 9. The final result of the calculation will be: 90.
Exercise 2: Write the next 3 numbers in the sequence
Solution Instructions: Find the rule of the number sequence (Ascending, Descending). Next is to find the rule of the numbers in the sequence (Increase or decrease by how many units). Finally find the missing numbers and fill in the blanks.
Eg: ten; 20; 30; 40; …; ….; …;
Comment: This is an ascending sequence of numbers because from the second number in the sequence, it equals the previous number plus 10.
So the number immediately after 40 will be 40 + 10 = 50. Do the same with the remaining numbers we will get the sequence: 10; 20; 30; 40; 50; 60; 70.
Form 2: Performing the calculation
Practical exercise 1: Set the calculation and then calculate
Solution Instructions:
Numbers in the same row will be aligned with each other (Hundreds straight hundreds, tens straight tens, rows of units in line with units).
Begin perform the addition with memory from the numbers in the smallest row (From units, to tens, hundreds,…).
Illustration:
Comments (First calculation): We have: 9 + 3 = 12, write 2 remember 1; Next we have: 1 + 4 = 5 remember 1. The final result is 62. The solution is similar for the remaining calculations.
See more: Tips for parents to teach 2nd grade math, easy to understand, easy to remember at home
Exercise 2: Circle the letter in front of the best answer
Solution guide: This exercise is similar to the one above. But it’s going to be a sequence of addition operations, and we’re going to do the math from left to right. After finding the final answer, circle the most correct answer.
Eg: 241 + 124 + 201 = ?
A. 665 ; B. 566 ; C. 656 ; D. 666
Comment: This is a 3-term calculation, and each term is a 3-digit number. Therefore, it is possible to split this calculation into 2 operations.
Calculation 1: 241 + 124 = 365
Calculation 2: 365 (Result of the first calculation) + 201 = 566
So the answer will be B. 566
Form 3: Compare
Exercises: Fill in the blanks with the appropriate sign ()
Solution Instructions:
Method 1: Calculate the total
Initially, we will calculate the sum of 1 side, then compare the results with the other side, and finally fill in the blanks with the appropriate sign.
Eg: 42 + 100 … 124
We perform the calculation: 42 + 100 = 142; Comparing 124 and 124 then 142 is greater than 124.
So 42 + 100 > 124
Method 2: Split the number
Split the side with a number into a sum, such that a number of rows in it is equal to a term on the other side. Compare the remaining terms between the two sides. Finally, fill in the blanks with the appropriate mark.
Eg: 42 + 100 … 124
We perform the separation of the number 124 = 24 + 100 (In which, both sides have an equal right-hand term of 100); Comparing the remaining two terms 24 and 42, then 42 > 24.
So 42 + 100 > 24 + 100 → Inferred: 42 + 100 > 124
Form 4: Find the unknown component of the calculation
Practical exercise 1: Find X
Solution Instructions: Determine the role of X (Number to be subtracted). If the right-hand side is a number, perform the calculation as usual. If the right-hand side is a sum, sum it up first and then do the search for X .
Eg:
Exercise 2: Fill in the missing digit with *
Solution Instructions: Also based on the principle of setting and then calculating, we perform in turn from right to left, from the smallest row to the largest row.
Note: If the * is in the Sum, we add as usual. But if the * is in a certain digit in the term, then we take that row digit from the sum minus that row digit in the remaining term.
Eg: * 5 + 42 = 7*
The * is in the tens of the first term and the units of the sum.
We have, the asterisk in the units row of sum = 5 + 2 = 7.
The asterisk is in the tens of the first term = tens of the sum – tens of the second term = 7 – 4 = 3
So, the full calculation would be: 35 + 42 = 77
Form 5: Quick calculation
Practical exercise: Calculate by convenience
Solution Instructions: Returns numbers round ten or round hundred. Then group the terms together, using the basic properties of addition, including: Commutative, associative.
Eg: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9
We see: 1 + 9 = 10; 2 + 8 = 10
Similar to the remaining terms, we get a sequence of numbers as follows:
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 1 + 9 + 2 + 8 + 3 + 7 + 4 + 6 + 5 = 10 + 10 + 10 + 10 + 5 = 45
The secret to learning 2nd grade math with effective memory addition
To help children learn well the knowledge of addition and remembering in grade 2, parents can support their children through the following methods and tips:
Build your child’s foundation and interest in math with Trường THPT Trần Hưng Đạo Math
Trường THPT Trần Hưng Đạo Math is known as an trực tuyến English thinking math teaching application developed by Trường THPT Trần Hưng Đạo specifically for preschool and primary school children, with the content closely following the latest educational program of the Ministry of Education and Training.
<img class="aligncenter" class="lazyload" src="https://monkeymedia.vcdn.com.vn/upload/web/img/8-toan-lop-2-phep-cong-co-nho.png" alt="Math learning software with modern educational methods Trường THPT Trần Hưng Đạo Math. (Photo: Trường THPT Trần Hưng Đạo)” >
Specifically, the lesson content on Trường THPT Trần Hưng Đạo Math will have 400+ lessons, with over 60 math topics from addition, subtraction, multiplication, and division to the knowledge children will learn in the elementary school program. Everything is taught in detail in the form of videos and funny animations. Through that, children will learn in a more interesting, easier to understand and memorize way instead of just learning from books.
At the same time, Trường THPT Trần Hưng Đạo Math provides more than 10,000 interactive activities such as games, puzzles, treasure discovery, etc. Through that, children can both play and learn math in a more exciting way. As well as helping children develop thinking & intelligence during the golden period of brain development, thereby having a greater love for math.
Parents can learn more about Trường THPT Trần Hưng Đạo Math through the following video or download the app to experience it with their children.
<span style="text-decoration-line: underline; font-size: 12pt; font-family: Montserrat, Arial; text-decoration-skip-ink: none;" data-sheets-value='{"1":2,"2":"Tải Trường THPT Trần Hưng Đạo Math miễn phí cho điện thoại Android”}’ data-sheets-userformat='{“2″:1325569,”3”:{“1″:0},”12″:0,”14”:{“1″:2,”2″:0},”15″:”Montserrat, sans-serif”,”16″:12,”21″:1,”23″:1}’ data-sheets-hyperlink=”https://play.google.com/store/apps/details?id=com.earlystart.monkeymath&hl=vi”>Download Trường THPT Trần Hưng Đạo Math for không lấy phí for Android phones
<span style="text-decoration-line: underline; font-size: 12pt; font-family: Montserrat, Arial; text-decoration-skip-ink: none;" data-sheets-value='{"1":2,"2":"Tải Trường THPT Trần Hưng Đạo Math miễn phí cho điện thoại Android”}’ data-sheets-userformat='{“2″:1325569,”3”:{“1″:0},”12″:0,”14”:{“1″:2,”2″:0},”15″:”Montserrat, sans-serif”,”16″:12,”21″:1,”23″:1}’ data-sheets-hyperlink=”https://play.google.com/store/apps/details?id=com.earlystart.monkeymath&hl=vi”><span style="font-size: 12pt; text-decoration-skip-ink: none;" data-sheets-value='{"1":2,"2":"Tải Trường THPT Trần Hưng Đạo Math miễn phí cho điện thoại iOS”}’ data-sheets-userformat='{“2″:1325569,”3”:{“1″:0},”12″:0,”14”:{“1″:2,”2″:0},”15″:”Montserrat, sans-serif”,”16″:12,”21″:1,”23″:1}’ data-sheets-hyperlink=”https://apps.apple.com/vn/app/monkey-math-tophần trămC3phần trămA1n-tiphần trămE1phần trămBAphần trămBFng-anh/id1298508851?l=vi”>Download Trường THPT Trần Hưng Đạo Math for không lấy phí for iOS phones
Help your child firmly grasp the 2nd grade math rules
For calculations that remember class 2 when performing will mainly rely on the rule “If a column is greater than or equal to 10, the remaining digit is “remembered” to the next column“. Therefore, parents need to explain and guide in detail step by step to solve the calculation so that their children can easily understand and absorb this knowledge instead of just saying it. Specifically:
- Step 1: Parents, please let your child write math operations in the form of vertical columns (note tens to correct tens, units to correct units of 2 terms).
- Step 2: Perform addition/subtraction with memory from units to tens from right to left.
Note: If the addition in units is large or equal to 10, the number in the units row should be put down the result, and the tens will add the number in the previous tens to form an exact result.
Let your child do the 2nd grade addition mental math exercises with real words
To help children easily visualize this form of math, parents can Take real-life exercises and ask your child to try them out. For example, parents can do a quiz, for example, if the child has 15 candies, the mother gives 6 more and asks how many total candies do you have? Initially, parents should ask their children to mentally calculate whether the results are correct, then let them practice counting the number of candies in their hands. Because with some big calculations you can’t count in the traditional way.
Practice with your child, practice doing math exercises, remembering grade 2
To improve the effectiveness of 2nd grade math learning plus with memory for children, parents should Ask your child to practice, practice often. The practice here can come from doing exercises assigned in class, in textbooks, learning more new knowledge on the internet, organizing math games to increase children’s interest,…
When practiced regularly will help Stimulate children’s brain development better, along with increase the ability to absorb, memorize and apply when solving math problems or applying in practice more exactly.
Some exercises to teach grade 2 math, addition, and memory for children to practice on their own
Here are some exercises on math problems about addition with memory in grade 2 so that your child can practice effectively on his own:
Lesson 1: Class 2A has 34 students, class 2B has 29 students. Calculate the total number of students in two classes 2A and 2B.
Lesson 2: An has 29 candies, his mother gives him 5 candies. How many candies does An have in all?
Lesson 3: Calculate then calculate
a) 6 + 37
b) 26 + 5
c) 56 + 6
d) 86 + 8
e) 67 + 9
f) 6 + 66
g) 5 +86
h) 56 + 4
i) 66 + 7
j) 57 + 18
k) 16 + 27
l) 57 + 16
m) 46 + 18
n) 58 + 16
Lesson 4: Mental arithmetic:
a) 6 + 5 = …….
b) 6 + 7 = …….
c) 9 + 6 = …….
d) 6 + 9 = …….
e) 6 + 4 = …….
g) 8+ 5 = …….
h) 9 + 6 = …….
i) 6 + 4 + 3 = …….
j) 9 + 1 + 8 = …….
k) 8 + 2 + 10 = …….
Lesson 5: Find x, know
a) x + 34 = 54
b) 38 + x = 68
c) 42 + x = 89
d) x + 62 = 96
e) x + 21 = 26 + 15
g) 22 + x = 39 + 36
h) x + 33 = 37 + 38
Lesson 6: Summarize by diagram and then solve the following problem: Last month, my group got 36 points out of ten. The score ten months ago is 7 points ten less than this month. Calculate this 10 month score?
Lesson 7: Put >, <, = in the dot
a) 26 + 5 … 17 + 9
b) 12 + 8 … 15 + 5
c) 17 + 9 … 24 + 8
d) 18 + 64 … 25 + 27
Lesson 8: Fill in the blanks with the correct number:
Lesson 9: Write the correct number in the blank:
Lesson 10: Three people went fishing, the first person caught 9 fish. The second person caught 17 fish. The third person caught 15 fish. Calculate the total number of fish caught by three people.
Above is a summary of concepts and 5 types 2nd grade math addition with memory Frequent. However, if you want your children to experience modern educational methods such as interactive comics, learn math through games, etc., then you can immediately refer to the application of learning Maths in English. Trường THPT Trần Hưng Đạo Math Please!
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Forms 2nd grade math addition with memory It is an important part of a child's elementary math curriculum. Understanding this, Trường THPT Trần Hưng Đạo has synthesized 5 common math types and the most detailed solutions. This is to make it easier for parents to review math at home for their children.
The concept of math addition with memory grade 2
Before learning about the knowledge surrounding problems about addition and subtraction remembering grade 2then let's review with Trường THPT Trần Hưng Đạo the definition of addition as well as the elements inside it.
Addition and elements to grasp
Addition is usually written with the plus symbol . "+" is one of the four basic operations of arithmetic, including: Summation, Subtraction, multiplication and division. The result of the addition of natural numbers is the sum of those numbers.
In addition, we need to pay attention to two important elements: term and sumis shown as shown below:
The concept of units, tens, hundreds
To be able to easily solve 2nd grade math forms Memory addition within 100then children need to understand the concepts of unit class (including: units, tens, hundreds). More specifically, you can guide your child through the following examples:
The concept of the addition of 2 digits with memory in elementary mathematics
In elementary mathematics, memorized additions are additions that When adding the terms in a certain row, the result is greater than 10.
This is also the most basic way to add multi-digit numbers. Specifically, the implementation would be to sort the terms vertically and add column by column starting from the units column on the right. If a column is greater than or equal to 10, the remaining digit is "remembered" to the next column.
For example, calculate the sum of 12 plus 88 below:
How to solve common math problems in grade 2 with memory
There are many ways to teach math addition with memory in grade 2, the easiest is for children to do various types of exercises. Here is how to solve the most common problem types in the program or 2nd grade exam questions.
Form 1: Mental calculation
Practical exercise 1: Mental calculation
Solution Instructions: First we need to look at the terms in the calculation to see if there is anything special about it. For example, all have zero units, or tens and zeros, and so on. Then we can do the addition as usual.
Eg: 20 + 30 + 40 = ?
Comment: We can easily see that the units of all three numbers in this calculation are zero, so we only need to care about the tens digits.
We have: 2 + 3 + 4 = 9, write 9. Then, write 0 after 9. The final result of the calculation will be: 90.
Exercise 2: Write the next 3 numbers in the sequence
Solution Instructions: Find the rule of the number sequence (Ascending, Descending). Next is to find the rule of the numbers in the sequence (Increase or decrease by how many units). Finally find the missing numbers and fill in the blanks.
Eg: ten; 20; 30; 40; …; ….; …;
Comment: This is an ascending sequence of numbers because from the second number in the sequence, it equals the previous number plus 10.
So the number immediately after 40 will be 40 + 10 = 50. Do the same with the remaining numbers we will get the sequence: 10; 20; 30; 40; 50; 60; 70.
Form 2: Performing the calculation
Practical exercise 1: Set the calculation and then calculate
Solution Instructions:
Numbers in the same row will be aligned with each other (Hundreds straight hundreds, tens straight tens, rows of units in line with units).
Begin perform the addition with memory from the numbers in the smallest row (From units, to tens, hundreds,…).
Illustration:
Comments (First calculation): We have: 9 + 3 = 12, write 2 remember 1; Next we have: 1 + 4 = 5 remember 1. The final result is 62. The solution is similar for the remaining calculations.
See more: Tips for parents to teach 2nd grade math, easy to understand, easy to remember at home
Exercise 2: Circle the letter in front of the best answer
Solution guide: This exercise is similar to the one above. But it's going to be a sequence of addition operations, and we're going to do the math from left to right. After finding the final answer, circle the most correct answer.
Eg: 241 + 124 + 201 = ?
A. 665 ; B. 566 ; C. 656 ; D. 666
Comment: This is a 3-term calculation, and each term is a 3-digit number. Therefore, it is possible to split this calculation into 2 operations.
Calculation 1: 241 + 124 = 365
Calculation 2: 365 (Result of the first calculation) + 201 = 566
So the answer will be B. 566
Form 3: Compare
Exercises: Fill in the blanks with the appropriate sign ()
Solution Instructions:
Method 1: Calculate the total
Initially, we will calculate the sum of 1 side, then compare the results with the other side, and finally fill in the blanks with the appropriate sign.
Eg: 42 + 100 … 124
We perform the calculation: 42 + 100 = 142; Comparing 124 and 124 then 142 is greater than 124.
So 42 + 100 > 124
Method 2: Split the number
Split the side with a number into a sum, such that a number of rows in it is equal to a term on the other side. Compare the remaining terms between the two sides. Finally, fill in the blanks with the appropriate mark.
Eg: 42 + 100 … 124
We perform the separation of the number 124 = 24 + 100 (In which, both sides have an equal right-hand term of 100); Comparing the remaining two terms 24 and 42, then 42 > 24.
So 42 + 100 > 24 + 100 → Inferred: 42 + 100 > 124
Form 4: Find the unknown component of the calculation
Practical exercise 1: Find X
Solution Instructions: Determine the role of X (Number to be subtracted). If the right-hand side is a number, perform the calculation as usual. If the right-hand side is a sum, sum it up first and then do the search for X .
Eg:
Exercise 2: Fill in the missing digit with *
Solution Instructions: Also based on the principle of setting and then calculating, we perform in turn from right to left, from the smallest row to the largest row.
Note: If the * is in the Sum, we add as usual. But if the * is in a certain digit in the term, then we take that row digit from the sum minus that row digit in the remaining term.
Eg: * 5 + 42 = 7*
The * is in the tens of the first term and the units of the sum.
We have, the asterisk in the units row of sum = 5 + 2 = 7.
The asterisk is in the tens of the first term = tens of the sum – tens of the second term = 7 – 4 = 3
So, the full calculation would be: 35 + 42 = 77
Form 5: Quick calculation
Practical exercise: Calculate by convenience
Solution Instructions: Returns numbers round ten or round hundred. Then group the terms together, using the basic properties of addition, including: Commutative, associative.
Eg: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9
We see: 1 + 9 = 10; 2 + 8 = 10
Similar to the remaining terms, we get a sequence of numbers as follows:
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 1 + 9 + 2 + 8 + 3 + 7 + 4 + 6 + 5 = 10 + 10 + 10 + 10 + 5 = 45
The secret to learning 2nd grade math with effective memory addition
To help children learn well the knowledge of addition and remembering in grade 2, parents can support their children through the following methods and tips:
Build your child's foundation and interest in math with Trường THPT Trần Hưng Đạo Math
Trường THPT Trần Hưng Đạo Math is known as an trực tuyến English thinking math teaching application developed by Trường THPT Trần Hưng Đạo specifically for preschool and primary school children, with the content closely following the latest educational program of the Ministry of Education and Training.
<img class="aligncenter" class="lazyload" src="https://monkeymedia.vcdn.com.vn/upload/web/img/8-toan-lop-2-phep-cong-co-nho.png" alt="Math learning software with modern educational methods Trường THPT Trần Hưng Đạo Math. (Photo: Trường THPT Trần Hưng Đạo)" >
Specifically, the lesson content on Trường THPT Trần Hưng Đạo Math will have 400+ lessons, with over 60 math topics from addition, subtraction, multiplication, and division to the knowledge children will learn in the elementary school program. Everything is taught in detail in the form of videos and funny animations. Through that, children will learn in a more interesting, easier to understand and memorize way instead of just learning from books.
At the same time, Trường THPT Trần Hưng Đạo Math provides more than 10,000 interactive activities such as games, puzzles, treasure discovery, etc. Through that, children can both play and learn math in a more exciting way. As well as helping children develop thinking & intelligence during the golden period of brain development, thereby having a greater love for math.
Parents can learn more about Trường THPT Trần Hưng Đạo Math through the following video or download the app to experience it with their children.
<span style="text-decoration-line: underline; font-size: 12pt; font-family: Montserrat, Arial; text-decoration-skip-ink: none;" data-sheets-value='{"1":2,"2":"Tải Trường THPT Trần Hưng Đạo Math miễn phí cho điện thoại Android"}' data-sheets-userformat='{"2":1325569,"3":{"1":0},"12":0,"14":{"1":2,"2":0},"15":"Montserrat, sans-serif","16":12,"21":1,"23":1}' data-sheets-hyperlink="https://play.google.com/store/apps/details?id=com.earlystart.monkeymath&hl=vi">Download Trường THPT Trần Hưng Đạo Math for không lấy phí for Android phones
<span style="text-decoration-line: underline; font-size: 12pt; font-family: Montserrat, Arial; text-decoration-skip-ink: none;" data-sheets-value='{"1":2,"2":"Tải Trường THPT Trần Hưng Đạo Math miễn phí cho điện thoại Android"}' data-sheets-userformat='{"2":1325569,"3":{"1":0},"12":0,"14":{"1":2,"2":0},"15":"Montserrat, sans-serif","16":12,"21":1,"23":1}' data-sheets-hyperlink="https://play.google.com/store/apps/details?id=com.earlystart.monkeymath&hl=vi"><span style="font-size: 12pt; text-decoration-skip-ink: none;" data-sheets-value='{"1":2,"2":"Tải Trường THPT Trần Hưng Đạo Math miễn phí cho điện thoại iOS"}' data-sheets-userformat='{"2":1325569,"3":{"1":0},"12":0,"14":{"1":2,"2":0},"15":"Montserrat, sans-serif","16":12,"21":1,"23":1}' data-sheets-hyperlink="https://apps.apple.com/vn/app/monkey-math-tophần trămC3phần trămA1n-tiphần trămE1phần trămBAphần trămBFng-anh/id1298508851?l=vi">Download Trường THPT Trần Hưng Đạo Math for không lấy phí for iOS phones
Help your child firmly grasp the 2nd grade math rules
For calculations that remember class 2 when performing will mainly rely on the rule "If a column is greater than or equal to 10, the remaining digit is "remembered" to the next column". Therefore, parents need to explain and guide in detail step by step to solve the calculation so that their children can easily understand and absorb this knowledge instead of just saying it. Specifically:
- Step 1: Parents, please let your child write math operations in the form of vertical columns (note tens to correct tens, units to correct units of 2 terms).
- Step 2: Perform addition/subtraction with memory from units to tens from right to left.
Note: If the addition in units is large or equal to 10, the number in the units row should be put down the result, and the tens will add the number in the previous tens to form an exact result.
Let your child do the 2nd grade addition mental math exercises with real words
To help children easily visualize this form of math, parents can Take real-life exercises and ask your child to try them out. For example, parents can do a quiz, for example, if the child has 15 candies, the mother gives 6 more and asks how many total candies do you have? Initially, parents should ask their children to mentally calculate whether the results are correct, then let them practice counting the number of candies in their hands. Because with some big calculations you can't count in the traditional way.
Practice with your child, practice doing math exercises, remembering grade 2
To improve the effectiveness of 2nd grade math learning plus with memory for children, parents should Ask your child to practice, practice often. The practice here can come from doing exercises assigned in class, in textbooks, learning more new knowledge on the internet, organizing math games to increase children's interest,...
When practiced regularly will help Stimulate children's brain development better, along with increase the ability to absorb, memorize and apply when solving math problems or applying in practice more exactly.
Some exercises to teach grade 2 math, addition, and memory for children to practice on their own
Here are some exercises on math problems about addition with memory in grade 2 so that your child can practice effectively on his own:
Lesson 1: Class 2A has 34 students, class 2B has 29 students. Calculate the total number of students in two classes 2A and 2B.
Lesson 2: An has 29 candies, his mother gives him 5 candies. How many candies does An have in all?
Lesson 3: Calculate then calculate
a) 6 + 37
b) 26 + 5
c) 56 + 6
d) 86 + 8
e) 67 + 9
f) 6 + 66
g) 5 +86
h) 56 + 4
i) 66 + 7
j) 57 + 18
k) 16 + 27
l) 57 + 16
m) 46 + 18
n) 58 + 16
Lesson 4: Mental arithmetic:
a) 6 + 5 = .......
b) 6 + 7 = .......
c) 9 + 6 = .......
d) 6 + 9 = .......
e) 6 + 4 = .......
g) 8+ 5 = .......
h) 9 + 6 = .......
i) 6 + 4 + 3 = .......
j) 9 + 1 + 8 = .......
k) 8 + 2 + 10 = .......
Lesson 5: Find x, know
a) x + 34 = 54
b) 38 + x = 68
c) 42 + x = 89
d) x + 62 = 96
e) x + 21 = 26 + 15
g) 22 + x = 39 + 36
h) x + 33 = 37 + 38
Lesson 6: Summarize by diagram and then solve the following problem: Last month, my group got 36 points out of ten. The score ten months ago is 7 points ten less than this month. Calculate this 10 month score?
Lesson 7: Put >, <, = in the dot
a) 26 + 5 … 17 + 9
b) 12 + 8 … 15 + 5
c) 17 + 9 … 24 + 8
d) 18 + 64 … 25 + 27
Lesson 8: Fill in the blanks with the correct number:
Lesson 9: Write the correct number in the blank:
Lesson 10: Three people went fishing, the first person caught 9 fish. The second person caught 17 fish. The third person caught 15 fish. Calculate the total number of fish caught by three people.
Above is a summary of concepts and 5 types 2nd grade math addition with memory Frequent. However, if you want your children to experience modern educational methods such as interactive comics, learn math through games, etc., then you can immediately refer to the application of learning Maths in English. Trường THPT Trần Hưng Đạo Math Please!
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[box type=”note” align=”” class=”” ltr”>The concept of math addition with memory grade 2
Before learning about the knowledge surrounding problems about addition and subtraction remembering grade 2then let’s review with Trường THPT Trần Hưng Đạo the definition of addition as well as the elements inside it.
Addition and elements to grasp
Addition is usually written with the plus symbol . “+” is one of the four basic operations of arithmetic, including: Summation, Subtraction, multiplication and division. The result of the addition of natural numbers is the sum of those numbers.
In addition, we need to pay attention to two important elements: term and sumis shown as shown below:
The concept of units, tens, hundreds
To be able to easily solve 2nd grade math forms Memory addition within 100then children need to understand the concepts of unit class (including: units, tens, hundreds). More specifically, you can guide your child through the following examples:
The concept of the addition of 2 digits with memory in elementary mathematics
In elementary mathematics, memorized additions are additions that When adding the terms in a certain row, the result is greater than 10.
This is also the most basic way to add multi-digit numbers. Specifically, the implementation would be to sort the terms vertically and add column by column starting from the units column on the right. If a column is greater than or equal to 10, the remaining digit is “remembered” to the next column.
For example, calculate the sum of 12 plus 88 below:
How to solve common math problems in grade 2 with memory
There are many ways to teach math addition with memory in grade 2, the easiest is for children to do various types of exercises. Here is how to solve the most common problem types in the program or 2nd grade exam questions.
Form 1: Mental calculation
Practical exercise 1: Mental calculation
Solution Instructions: First we need to look at the terms in the calculation to see if there is anything special about it. For example, all have zero units, or tens and zeros, and so on. Then we can do the addition as usual.
Eg: 20 + 30 + 40 = ?
Comment: We can easily see that the units of all three numbers in this calculation are zero, so we only need to care about the tens digits.
We have: 2 + 3 + 4 = 9, write 9. Then, write 0 after 9. The final result of the calculation will be: 90.
Exercise 2: Write the next 3 numbers in the sequence
Solution Instructions: Find the rule of the number sequence (Ascending, Descending). Next is to find the rule of the numbers in the sequence (Increase or decrease by how many units). Finally find the missing numbers and fill in the blanks.
Eg: ten; 20; 30; 40; …; ….; …;
Comment: This is an ascending sequence of numbers because from the second number in the sequence, it equals the previous number plus 10.
So the number immediately after 40 will be 40 + 10 = 50. Do the same with the remaining numbers we will get the sequence: 10; 20; 30; 40; 50; 60; 70.
Form 2: Performing the calculation
Practical exercise 1: Set the calculation and then calculate
Solution Instructions:
Numbers in the same row will be aligned with each other (Hundreds straight hundreds, tens straight tens, rows of units in line with units).
Begin perform the addition with memory from the numbers in the smallest row (From units, to tens, hundreds,…).
Illustration:
Comments (First calculation): We have: 9 + 3 = 12, write 2 remember 1; Next we have: 1 + 4 = 5 remember 1. The final result is 62. The solution is similar for the remaining calculations.
See more: Tips for parents to teach 2nd grade math, easy to understand, easy to remember at home
Exercise 2: Circle the letter in front of the best answer
Solution guide: This exercise is similar to the one above. But it’s going to be a sequence of addition operations, and we’re going to do the math from left to right. After finding the final answer, circle the most correct answer.
Eg: 241 + 124 + 201 = ?
A. 665 ; B. 566 ; C. 656 ; D. 666
Comment: This is a 3-term calculation, and each term is a 3-digit number. Therefore, it is possible to split this calculation into 2 operations.
Calculation 1: 241 + 124 = 365
Calculation 2: 365 (Result of the first calculation) + 201 = 566
So the answer will be B. 566
Form 3: Compare
Exercises: Fill in the blanks with the appropriate sign ()
Solution Instructions:
Method 1: Calculate the total
Initially, we will calculate the sum of 1 side, then compare the results with the other side, and finally fill in the blanks with the appropriate sign.
Eg: 42 + 100 … 124
We perform the calculation: 42 + 100 = 142; Comparing 124 and 124 then 142 is greater than 124.
So 42 + 100 > 124
Method 2: Split the number
Split the side with a number into a sum, such that a number of rows in it is equal to a term on the other side. Compare the remaining terms between the two sides. Finally, fill in the blanks with the appropriate mark.
Eg: 42 + 100 … 124
We perform the separation of the number 124 = 24 + 100 (In which, both sides have an equal right-hand term of 100); Comparing the remaining two terms 24 and 42, then 42 > 24.
So 42 + 100 > 24 + 100 → Inferred: 42 + 100 > 124
Form 4: Find the unknown component of the calculation
Practical exercise 1: Find X
Solution Instructions: Determine the role of X (Number to be subtracted). If the right-hand side is a number, perform the calculation as usual. If the right-hand side is a sum, sum it up first and then do the search for X .
Eg:
Exercise 2: Fill in the missing digit with *
Solution Instructions: Also based on the principle of setting and then calculating, we perform in turn from right to left, from the smallest row to the largest row.
Note: If the * is in the Sum, we add as usual. But if the * is in a certain digit in the term, then we take that row digit from the sum minus that row digit in the remaining term.
Eg: * 5 + 42 = 7*
The * is in the tens of the first term and the units of the sum.
We have, the asterisk in the units row of sum = 5 + 2 = 7.
The asterisk is in the tens of the first term = tens of the sum – tens of the second term = 7 – 4 = 3
So, the full calculation would be: 35 + 42 = 77
Form 5: Quick calculation
Practical exercise: Calculate by convenience
Solution Instructions: Returns numbers round ten or round hundred. Then group the terms together, using the basic properties of addition, including: Commutative, associative.
Eg: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9
We see: 1 + 9 = 10; 2 + 8 = 10
Similar to the remaining terms, we get a sequence of numbers as follows:
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 1 + 9 + 2 + 8 + 3 + 7 + 4 + 6 + 5 = 10 + 10 + 10 + 10 + 5 = 45
The secret to learning 2nd grade math with effective memory addition
To help children learn well the knowledge of addition and remembering in grade 2, parents can support their children through the following methods and tips:
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Specifically, the lesson content on Trường THPT Trần Hưng Đạo Math will have 400+ lessons, with over 60 math topics from addition, subtraction, multiplication, and division to the knowledge children will learn in the elementary school program. Everything is taught in detail in the form of videos and funny animations. Through that, children will learn in a more interesting, easier to understand and memorize way instead of just learning from books.
At the same time, Trường THPT Trần Hưng Đạo Math provides more than 10,000 interactive activities such as games, puzzles, treasure discovery, etc. Through that, children can both play and learn math in a more exciting way. As well as helping children develop thinking & intelligence during the golden period of brain development, thereby having a greater love for math.
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Help your child firmly grasp the 2nd grade math rules
For calculations that remember class 2 when performing will mainly rely on the rule “If a column is greater than or equal to 10, the remaining digit is “remembered” to the next column“. Therefore, parents need to explain and guide in detail step by step to solve the calculation so that their children can easily understand and absorb this knowledge instead of just saying it. Specifically:
- Step 1: Parents, please let your child write math operations in the form of vertical columns (note tens to correct tens, units to correct units of 2 terms).
- Step 2: Perform addition/subtraction with memory from units to tens from right to left.
Note: If the addition in units is large or equal to 10, the number in the units row should be put down the result, and the tens will add the number in the previous tens to form an exact result.
Let your child do the 2nd grade addition mental math exercises with real words
To help children easily visualize this form of math, parents can Take real-life exercises and ask your child to try them out. For example, parents can do a quiz, for example, if the child has 15 candies, the mother gives 6 more and asks how many total candies do you have? Initially, parents should ask their children to mentally calculate whether the results are correct, then let them practice counting the number of candies in their hands. Because with some big calculations you can’t count in the traditional way.
Practice with your child, practice doing math exercises, remembering grade 2
To improve the effectiveness of 2nd grade math learning plus with memory for children, parents should Ask your child to practice, practice often. The practice here can come from doing exercises assigned in class, in textbooks, learning more new knowledge on the internet, organizing math games to increase children’s interest,…
When practiced regularly will help Stimulate children’s brain development better, along with increase the ability to absorb, memorize and apply when solving math problems or applying in practice more exactly.
Some exercises to teach grade 2 math, addition, and memory for children to practice on their own
Here are some exercises on math problems about addition with memory in grade 2 so that your child can practice effectively on his own:
Lesson 1: Class 2A has 34 students, class 2B has 29 students. Calculate the total number of students in two classes 2A and 2B.
Lesson 2: An has 29 candies, his mother gives him 5 candies. How many candies does An have in all?
Lesson 3: Calculate then calculate
a) 6 + 37
b) 26 + 5
c) 56 + 6
d) 86 + 8
e) 67 + 9
f) 6 + 66
g) 5 +86
h) 56 + 4
i) 66 + 7
j) 57 + 18
k) 16 + 27
l) 57 + 16
m) 46 + 18
n) 58 + 16
Lesson 4: Mental arithmetic:
a) 6 + 5 = …….
b) 6 + 7 = …….
c) 9 + 6 = …….
d) 6 + 9 = …….
e) 6 + 4 = …….
g) 8+ 5 = …….
h) 9 + 6 = …….
i) 6 + 4 + 3 = …….
j) 9 + 1 + 8 = …….
k) 8 + 2 + 10 = …….
Lesson 5: Find x, know
a) x + 34 = 54
b) 38 + x = 68
c) 42 + x = 89
d) x + 62 = 96
e) x + 21 = 26 + 15
g) 22 + x = 39 + 36
h) x + 33 = 37 + 38
Lesson 6: Summarize by diagram and then solve the following problem: Last month, my group got 36 points out of ten. The score ten months ago is 7 points ten less than this month. Calculate this 10 month score?
Lesson 7: Put >, <, = in the dot
a) 26 + 5 … 17 + 9
b) 12 + 8 … 15 + 5
c) 17 + 9 … 24 + 8
d) 18 + 64 … 25 + 27
Lesson 8: Fill in the blanks with the correct number:
Lesson 9: Write the correct number in the blank:
Lesson 10: Three people went fishing, the first person caught 9 fish. The second person caught 17 fish. The third person caught 15 fish. Calculate the total number of fish caught by three people.
Above is a summary of concepts and 5 types 2nd grade math addition with memory Frequent. However, if you want your children to experience modern educational methods such as interactive comics, learn math through games, etc., then you can immediately refer to the application of learning Maths in English. Trường THPT Trần Hưng Đạo Math Please!
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