The operation to find the sum of different values ​​is called addition. Let us know some adding facts that will help us learn how to add 4 digit and 5 digit numbers.

1. Adding small numbers can be done horizontally.

Example: 6 + 2 + 3 = 11

2. Large numbers are added in vertical columns (written under the location value table).

Example:

Th HT O.

7 2 5 8

1 3 6 2

+ 1 4 2 6

1 0 0 4 6

3. A zero added to a number does not change the place of the number.

HT O.

3 2 5

+ 0

3 2 5

4th The number or values ​​that are added are called the addends, and the answer is called the sum. 5. 1 added to a number gives the successor of the number as a sum. 6th To find a missing addend in an addition sum, the specified addend or the sum of all specified addends is subtracted from the specified sum. Working method: 7th Changing the order of the addend in an addition sum does not change the answer.

Example: (i) 45 + 26 = 26 + 45 = 71

(ii) 3 + 2 + 6 = 6 + 2 + 3 = 11

8th. While adding more than two numbers, we can group any two numbers together first. It doesn’t change the total.

Example: 7 + (9 + 3) = 7 + 12 = 19

or

(7 + 3) + 9 = 10 + 9 = 19

This fact helps us group any two addends for ease of adding.

Example: = (95 + 5) + 23

= 100 + 23

= 123

Let’s give a quick look at what we learned about adding a three-digit number in the previous class.

To add two-digit numbers, the numbers are written one below the other. The tens and units should be below each other. Questions and answers about the 3rd class addition fact:

I. Solve the following sums and assign them to the correct answer.

 a. 20 + 5 b. 13 + 8 c. 17 + 7 d. 12 + 1 e. 14 + 6 f. 9 + 9 1. 20 2. 18th 3. 21st 4. 24 5. 13 6. 25

Reply:

1. a. → 6

b. → 3

c. → 4

d. → 5

e. → 1

f. → 2

2. Add the following numbers:

(i) 34 + 3 = _____

(ii) 53 + 12 = _____

(iii) 17 + 8 = _____

(iv) 46 + 18 = _____

(v) 60 + 11 = _____

(vi) 82 + 6 = _____

(vii) 72 + 22 = _____

(viii) 21 + 5 = _____

Reply:

2. (i) 37

(ii) 65

(iii) 25

(iv) 64

(v) 671

(vi) 88

(vii) 94

(viii) 26

3. Add the number of the middle circle to the number indicated in the inner circle. Write the sum in the outer circle:

4. Enter the missing numbers:

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