- 16 ○ 4 = 4, what is ○?
- 9 ○ 7 = 63, what is ○?
- 32 __ 4 = 8
- 4 ○ 6 = 10, what is ○?
- 14 __ 2 = 7
- 6 ○ 9 = 54, what is ○?
- 8 __ 5 = 40
- 3 __ 1 = 4
- 40 __ 8 = 5
- 5 ○ 1 = 4, what is ○?
- 4 __ 10 = 40
- 10 __ 9 = 19
- 7 __ 9 = 63
- 18 ○ 6 = 3, what is ○?
- 14 ○ 2 = 7, what is ○?
- 16 ○ 7 = 9, what is ○?
- 10 __ 2 = 5
- 1 __ 8 = 9
- 1 ○ 1 = 2, what is ○?
- 4 ○ 9 = 36, what is ○?