Hint



7
3
–
2
9
Do you need to rename a ten to do this sum?
Yes
No
7
3
–
2
9
You must cross out the 7.
How many tens are there in the ten house now?
Submit
6
7
3
–
2
9
We bring the ten over to the units house.
There are already 3 units here.
How many units are there in the unit house now?
Submit
6
13
7
3
–
2
9
Now you can subtract the units.
Submit
6
13
7
3
–
2
9
4
Now you can subtract the tens
Submit