One-digit by one-digit
2 x 2
4
12 x 2
24
12 x 12
144
154 x 3
462
1506 x 2
3012
4 x 3
12
14 x 4
56
15 x 13
195
245 x 5
1225
3546 x 4
14,184
5 x 7
35
20 x 7
140
22 x 17
374
382 x 7
2674
5340 x 5
26,700
6 x 8
48
46 x 8
368
47 x 36
1692
596 x 8
4768
7054 x 7
49,378
9 x 9
81
67 x 9
603
78 x 54
4212
736 x 9
6624
9582 x 9
86,238