This one here was an addition problem. The grid was the usual 1-9 in a series moving from left to right as in:
1 2 3
4 5 6
7 8 9
The numbers were represented in this fashion:
A dot in the quadrant counts for the number it is beside. To explain this further when a dot is in the top quadrant it counts as 1, when the dot is on the right hand side it is worth 2, when the dot is on the bottom it is worth 4, and when the dot is on the left it is worth 8. When a number other than 1, 2, 4 or 8 is to be represented you use dots in multiple locations. When dots are placed in more than one position they are connected by a line. In this way the last panel is meant to be worth 9 so you would place two dots at 8 and 1 and draw a line to connect them. As such the answer would be (G).