The operation to find the total of different values is called addition. Let us know some facts about addition which will help us to learn to add 4-digit and 5-digit numbers.

1. Addition of small numbers can be done horizontally.

Example: 6 + 2 + 3 = 11

2. Large numbers are added in vertical columns (written under the place value chart).

Example:

Th     H     T     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 value of the number.

H     T     O

3     2     5

+                   0

3     2     5

4. The number or values being added are called addends and the answer is called the sum.

5. 1 added to a number gives the successor of the number as the sum.

6. To find a missing addend in an addition sum, the given addend or the sum of all the given addends is subtracted from the given sum.

Workings:

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

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

8. While adding more than two numbers, we can group any two numbers first. It does not change the sum.

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

or

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

This fact helps us to group any two addends to make addition easy.

Example: = (95 + 5) + 23

= 100 + 23

= 123

Let us have a quick review of what we have learnt about addition of 3- digit number in the previous class.

To add 2- digit numbers, the numbers are written one below the others. The tens and ones digits should appear are below the other.

1. Solve the following sums and match them with the correct answer.

 a. 20 + 5                            b. 13 + 8   c. 17 + 7                               d. 12 + 1    e. 14 + 6    f. 9 + 9 1. 202. 183. 214. 245. 13 6. 25

1. a. → 6

b. → 3

c. → 4

d. → 5

e. → 1

f. → 2

2. Add the number of the middle circle with the number given in the inner circle. Write the sum in the outer circle:

(i)

(ii)

2. (i)

(ii)

3. Fill in the missing numbers:

3.

(i) 34 + 3 = _____

(ii) 53 + 12  = _____

(iii) 17 + 8  = _____

(iv) 46 + 18  = _____

(v) 60 + 11  = _____

(vi) 82 + 6  = _____

(vii) 72 + 22  = _____

(viii) 21 + 5  = _____

4. (i) 37

(ii) 65

(iii) 25

(iv) 64

(v) 671

(vi) 88

(vii) 94

(viii)26

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