when you have 125+136 5+6=11 so the first 1 would go above the 2 & 3. that's why to not have a two digit number in one place
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Regroup was created in 2006.
Regroup? Seriously? It is convert! 81*100=8100
No
If the total in any column exceeds nine, you will have to regroup.
Any number. Not everyone needs to regroup.