- 2 ○ 10 = 12, what is ○?
- 7 ○ 4 = 28, what is ○?
- 2 __ 6 = 12
- 12 ○ 2 = 6, what is ○?
- 54 __ 6 = 9
- 4 ○ 9 = 36, what is ○?
- 7 ○ 5 = 35, what is ○?
- 16 __ 8 = 8
- 6 __ 5 = 11
- 8 __ 7 = 15
- 2 __ 7 = 14
- 20 __ 10 = 2
- 4 ○ 3 = 7, what is ○?
- 7 __ 6 = 1
- 3 ○ 3 = 9, what is ○?
- 3 __ 10 = 30
- 28 ○ 7 = 4, what is ○?
- 7 __ 9 = 63
- 4 ○ 3 = 1, what is ○?
- 8 ○ 1 = 9, what is ○?