math
7x9
63
9x8
72
12x13
156
12x15
188
12x17
204
12x9
108
9x7
63
15x14
210
27x23
621
42x12
504
6x9
54
12x10
120
20x30
600
80x10
800
300x1,000
300,000
12x12
144
41x51
2,091
100x100
10,000
63x40
2,520
400x1,000
400,000
12x7
84
40x40
1,600
10x100
1,000
50x60
3,000
500x1,000
500,000