upside down triangle=0
because equals itself no matter which number you multiple it by so it has to be 0
8 point star=9, rectangle=3, circle=12 and oval=4
because it is a squared number that has to be between 0-12 and the only options for that are 1,9,4 and it can't be 1 because all the shapes would be the same in that equation if it was. To figure out which square number it was I looked at another equation with a square number in (equation a) and so I tried putting in both 9 and 4 to preplace the oval and 3 and 2 to replace the rectangle. I ended up figuring out that the only way the product of the equation could stay under 12 would be if the rectangle=3, the oval=4, circle=12 and so the 8 point star would have to equal 9.
square=2
since the oval= square x square I knew that the square equalled the square root 4 which is two.
equilateral triangle=6
I know this because in equation E I could replace the square and circle with their real values which would make triangle x 2=12 which would make the triangle 6 because 2x6=12.
Semi circle=8
I know this because, in equation B, if the put in the shapes real value, it reads 2x4=semi circle. 2x4 equals 8 so the semi circle is eight.
The rhombus=1
I know this because equation H has says rhombus x hexagon=hexagon and because the hexagon cannot be 0 it means that the rhombus must be 1.
5 point star=5 and hexagon=10
I know this because Equation G ,if you put in the shapes values, says 2xstar=hexagon. The remaining numbers are 5,7,10,11 and the only number there that can be multiplied by 2 and equal another number in that list was 5 so the star=5 and 5x2=10 so the hexagon=10.