Addition
156+156
312
20-10
10
I have 3 sides
Triangle
20+20+20
60
9+8
17
200+800
1,000
950-200
750
I have 4 square corners
Square
25+25+25
75
5+7
12
542+258
800
544-144
400
I am a 3D with square faces
Cube
150+150+150
450
13+5
18
355+213
568
25-25
0
I have 4 sides. The top and bottom are the same length and the left and right are the same length.
Rectangle
225+225+225+225
900
4+8
12
1,000+1,000
2,000
1,000-500
500
I have 6 sides and 6 angles.
Hexagon
500+500+500
1,500
3+7
10