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Example 2. Add 30 and 10.
Solution.

T O
+ = 3 0

+ 1 0

3 tens + 1 ten = 4 tens 4 0

Thus, 30 + 10 = 40.

Exercise 7B

Add vertically.

1. T O 2. T O 3. T O 4. T O 5. T O

3 0 3 0 7 0 4 0 3 0

+ 2 0 + 3 0 + 1 0 + 2 0 + 4 0

6. T O 7. T O 8. T O 9. T O 10. T O

2 0 5 0 6 0 7 0 2 0

+ 4 0 + 3 0 + 1 0 + 2 0 + 6 0

AddinG 2-diGit nuMBErS

using Expanded Form

Example 1. Add 73 and 26.
T O
Solution. Write the given

numbers in expanded form 7 3 7 tens and 3 ones
and then add. + 2 6 + 2 tens and 6 ones

Thus, 73 + 26 = 99. 9 9 9 tens and 9 ones

109
Addition and Subtraction up to 100