Subtraction practice

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

1. 4 - 1=____
2. 5 - 4=____
3. 6 - 3=____
4. 4 - 3=____
5. 1 - 1=____
6. 10 - 9=____
7. 3 - 1=____
8. 6 - 3=____