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Step 1. First add the ones and regroup. Step 2. Then add the tens.
3 + 7 = 10 ones = 1 ten 0 ones 1 + 2 = 3 tens

Write 0 in the ones column and Write 3 in the tens column.

carry over 1 to the tens column.
t O
t O 1

1 2 3
2 3 + 7
+ 7 3 0

0

Thus, 23 + 7 = 30. So, Shikha has 30 crayons now.

example 1: Add 25 and 35.
Solution:

Step 1. First add the ones and regroup. Step 2. Then add the tens.

5 + 5 = 10 ones = 1 ten 0 ones 1 + 2 + 3 = 6 tens

Write 0 in the ones column and Write 6 in the tens column.
carry over 1 to the tens column.

t O
t O 1

1 2 5
2 5 + 3 5
+ 3 5 6 0
0

Thus, 25 + 35 = 60

example 2: Find the sum of:

(a) 74 + 6. (b) 27 + 33.

Solution: (a) t O t O (b) t O t O

1 1 1 1
7 4 7 4 2 7 2 7
+ 6 + 6 + 3 3 + 3 3

0 8 0 0 6 0

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