Regroup ones into a ten

~10 min

If the ones make 10 or more, trade 10 ones for 1 ten.

Ones can make a ten

10
10 ones

When you add the ones, if you get 10 or more, you can make a new ten. Ten ones is the same as 1 ten.

💡 Look at the ones digits first to see if you can make a new ten.