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If you had to subtract 426 from 913, how many times would you need to regroup? how can you tell?

User Heystewart
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Regrouping in subtraction means that if you can't subtract because the digit on the bottom has a greater value than the digit on the top (such as 3-6)m so in this case you would have to regroup twice.
User HoseinGhanbari
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