Subtraction practice

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

1. 40 - 19=____
2. 35 - 20=____
3. 45 - 4=____
4. 29 - 16=____
5. 15 - 14=____
6. 12 - 3=____
7. 23 - 2=____
8. 17 - 6=____