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Why do you sometimes need to regroup in 3 digit addition problems

Why do you sometimes need to regroup in 3 digit addition problems
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Why do you sometimes need to regroup in 3 digit addition problems

User Iron Bishop
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Because for example 349+567 is something you need to regroup.You start by the ones.9+7=16. You don't always need to regroup though
User Nldoc
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