Regroup ones when adding
~10 min
If ones total 10 or more, regroup 10 ones as 1 ten.
When to Regroup Ones
15
4 thousands
8 hundreds
2 tens
7 ones
When you add the ones and get a total of 10 or more, you must regroup them into a new ten.
💡 If your ones answer has two digits, it is time to regroup!