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example: Add 36 and 18.
Solution: Arrange the numbers one below the other according to the place values

of digits. Then add.

Step 1. Add the ones and regroup. Step 2. Add the tens.
6 + 8 = 14 ones = 1 ten 4 ones 1 + 3 + 1 = 5 tens

Write 4 in the ones column and Write 5 in the tens column.
carry over 1 to the tens column.

t O

t O 1
1 3 6

3 6 + 1 8
+ 1 8 5 4

4

Thus, 36 + 18 = 54

Get it right!

t O Note
t O 1 Don’t miss regrouping the
5 9 5 9 ones into tens and ones
+ 3 6 + 3 6 when there are more than
9 ones.
8 15 7 9 5 3

Think and Answer

In the following addition tree, each number is the sum of the two numbers just
below it. Find the missing numbers for each blank.
1. 2. 3.

21

12 9 12

2 7 5 5 4 2 3 8 4

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