24037

If we use the form of algebra and name the bottom left corner y, and then the next four circles to its right as y+1, y+2 and y+3, this is because they are consequative numbers. Because y add y+1 equals 2y+1 this shows the value of that particular circle above y. Using these values we can work out the values of the next circles to the right of 2y+1, being 2y+3 and 2y+5 using the same formula from the bottom circles. Then by adding the values of y we can work out the following values of the missing circles above. The value of the top circle can be worked out using the formula: (yx8)+12.