10x8
8x8
7x7
5x5
10x3
7x3
9x3
7x6
10x7
9x8
10x5
10x9
10x6
9x7
7x8
9x4
9x9
2x7
4x8
9x6
3x2
3x4
5x2
7x9
4x4
6x9
6x3
3x5
8x3
4x6
How many groups did you circle?
Type the unit as well.