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Addition And subtrACtion using exPAnded form

Example 1: Add: 33 + 45 Example 2: Subtract: 78 – 33

Solution: Solution:

tens Ones tens Ones

3 3 = 3 tens + 3 ones 7 8 = 7 tens + 8 ones

+ 4 5 = 4 tens + 5 ones – 3 3 = 3 tens + 3 ones

7 8 = 7 tens + 8 ones 4 5 = 4 tens + 5 ones

There are two subtraction facts for 33 + 45 = 78. One 78 – 33 = 45 is done above.

Write the other one. __________

Practice time 6g

1. Add the following by expanding the numbers.

(a) 34 and 23 (b) 45 and 23

tens Ones tens Ones

= + = +

+ = + + = +
= + = +

(c) 41 and 32 (d) 55 and 11

tens Ones tens Ones

= + = +

+ = + + = +
= + = +

(e) 67 and 31 (f) 14 and 61

tens Ones tens Ones

= + = +

+ = + + = +
= + = +

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