Regrouping
Regrouping (sometimes called carrying or borrowing) means trading 10 ones for 1 ten, or the reverse, when adding or subtracting larger numbers. For example, adding 27 + 15, you add the ones (7 + 5 = 12), trade 10 of those ones for 1 ten, and carry that ten into the tens column to get 42.
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This final covers a lot of topics, so it's split into 2 parts. Each part includes a question from every one of its topics.
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