Subtraction practice

Solve each problem. Use the scratch space if you need it.

1. 8 - 1=____
2. 1 - 1=____
3. 6 - 6=____
4. 4 - 1=____
5. 3 - 1=____
6. 4 - 2=____
7. 3 - 1=____
8. 9 - 1=____