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Add and subtract tens
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Learn it Adding or subtracting tens changes only the tens digit. 30 + 40 is 3 tens + 4 tens = 7 tens = 70.
Example: $53 + 20$
- 53 has 5 tens and 3 ones.
- Add 2 tens: 7 tens and 3 ones.
- $53 + 20 = $ 73.
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