1. 4 + 3 =
2. 11 – 1 =
3. 5 + 1 =
4. 17 – 3 =
5. 7 + 4 =
6. 5 + 4 =
7. 1 + 1 + 1 =
8. 13 – 2 =
9. 30 – 20 =
10. 5 – 5 =
11. 5 – 4 =
12. 2 + 2 – 1 =
13. 10 + 18 =
14. 18 – 10 =
15. 3 + 3 =
16. 7 + 7 =