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Practice time 7A

Add the following.

1. tens Ones 2. tens Ones 3. tens Ones 4. tens Ones

1 5 4 1 2 5 5 8

+ 4 + 6 + 3 + 0

5. tens Ones 6. tens Ones 7. tens Ones 8. tens Ones

7 4 8 1 3 4 6 2

+ 4 + 7 + 5 + 7

Addition in tens

Example 1: Add 20 and 30.

Solution: We first take 2 tens and 3 tens. Then count and find 5 tens in all.

tens Ones

2 0
+ = + 3 0

5 0

2 tens + 3 tens = 5 tens

Thus, 20 + 30 = 50.

Example 2: Add 30 and 10.

Solution: We already have 3 tens. If we get 1 ten more, we will have 4 tens in all.

tens Ones

3 0
+ = + 1 0

4 0

3 tens + 1 ten = 4 tens

Thus, 30 + 10 = 40.

Mathematics-1 105