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Q: How can you tell how many times you need to regroup if you had to subtract 426 from 913?

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No idea sorry bud.

With addition, you need to regroup in the event that there are more than 10 ones or 10 tens. In a subtraction, you must regroup whenever there are insufficient ones or tens to subtract.

-423

No

you need to regroup when the bottom number is bigger than the top number

108

no

If the total in any column exceeds nine, you will have to regroup.

Ten times because 6 minus 10 times 0.6 = 0

Yes.

38

No.

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