Page 52 - ICSE Math 2

Addition of Three 2-Digit Numbers

To add three 2-digit numbers, follow the same steps that we follow to add two

2-digit numbers.

Let’s add 23, 12 and 43.

T O
Step 1: Add the ones of the first two numbers.
2 3

3 + 2 = 5
1 2
Add the sum 5 to the ones of the third number.
+ 4 3
5 + 3 = 8
8

T O
Step 2: Add the tens of the first two numbers.
2 3

2 + 1 = 3
1 2
Add the sum 3 to the tens of the third number.
+ 4 3
3 + 4 = 7
7 8
So, 23 + 12 + 43 = 78.

3. Find the sum of the given numbers.

T O T O T O
(a) (b) (c)
2 4 1 2 0 5

3 1 0 5 5 0

+ 0 3 + 6 1 + 2 3

T O T O T O
(d) (e) (f)
6 2 3 4 2 4

1 4 0 2 0 1

+ 0 3 + 5 3 + 5 2

42