Add and subtract three-digit numbers

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Learn it Line up hundreds, tens and ones. Add or subtract the ones first, then the tens, then the hundreds, regrouping when a column makes 10 or more (or is too small).

Example: $245 + 138$

Ones: 5 + 8 = 13. Write 3, carry 1 ten.
Tens: 4 + 3 + 1 = 8.
Hundreds: 2 + 1 = 3. Answer 383.

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