- To find the number in a square, we have to multiply two circles which are connected to it.
- So, to find a number in a circle, we have divide the number in the square by the number in the circle connected to it.
- Therefore, -6 ÷ -3 = 2
- 12 ÷ 2 = 6
- 6 × -3 = -18
Please find the attached photograph for their positions.
Hope you could get an idea from here
Doubt clarification - use comment section.