11. What is 12 + 18?
12. What is 100 ÷ 5?
13. What is 9 × 8?
14. What is 15 × 4?
15. What is 64 ÷ 8?
16. What is 3 × 6 + 4?
17. What is 35 ÷ 7?
18. What is 18 ÷ 3?
19. What is 4 × 9?
20. What is 90 ÷ 9?