No
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If the total in any column exceeds nine, you will have to regroup.
Yes.
Yes.
Regroup was created in 2006.
You need to regroup when you add the numbers together and they add up to a number that is ten or more. For example: 1 164 +518 _____ 682 If it is over ten, take the first digit of the number and put it above the next number. Then, add that number onto the sum of the other digits underneath it.