Addition
2 + 3
5
5 - 4
1
How many 10s in 30?
3
How many 5s in 10?
2
I have 3 sides.
Triangle
5 + 8
13
10 - 3
7
How many 10s in 90?
9
How many 5s in 30?
6
I have 2 long and 2 short sides.
Rectangle or parallelogram
12 + 24
36
22 - 14
8
How many 10s in 120
12
How many 5s in 60?
12
I have zero sides.
Circle or sphere
250 + 25
275
100 - 20
80
How many 10s in 240?
24
How many 5s in 100?
20
I have 6 identical (exactly the same size and shape) faces.
Cube
1,000 + 1,000
2,000
242 - 102
140
How many 10s in 740?
74
How many 5s in 200?
40
My base is a circle, and at my other end is a point. I have a single edge with no corners.
Cone