Hint



3
1
–
7
Do you need to rename a ten to do this sum?
Yes
No
3
1
–
7
You must cross out the 3.
How many tens are there in the ten house now?
Submit
2
3
1
–
7
We bring the ten over to the units house.
How many units are there in the unit house now?
Submit
2
11
3
1
–
7
Now you can subtract the units!
Submit
2
11
3
1
–
7
4
Now you can subtract the tens!
Submit