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
Th
0
H
0
T
1
O
0
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.