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What does it mean when you regroup?

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when you make groups of ten when performing operations such as addition or subtraction.

For example, in 2 digit addition, you might have 15 + 17. In this case, you need to regroup. When you add 5 + 7 you have 12, or one ten and two units. So, you regroup the tens into the tens column and leave the two units.
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