Multiplication Table!
You can make a multiplication table.
Since 1 times any number is just that number, we can leave
the 1's off. Multiplying a number on the left by a number on the top gives you
the number ("product") where the row (across) meets the column (down).
Here's
x | 2 3 4 5 6 7 8 9 10 11 12
--+------------------------------------------
2 | 4 6 8 10 12 14 16 18 20 22 24
3 | 6 9 12 15 18 21 24 27 30 33 36
4 | 8 12 16 20 24 28 32 36 40 44 48
5 |10 15 20 25 30 35 40 45 50 55 60
6 |12 18 24 30 36 42 48 54 60 66 72
7 |14 21 28 35 42 49 56 63 70 77 84
8 |16 24 32 40 48 56 64 72 80 88 96
9 |18 27 36 45 54 63 72 81 90 99 108
10 |20 30 40 50 60 70 80 90 100 110 120
11 |22 33 44 55 66 77 88 99 110 121 132
12 |24 36 48 60 72 84 96 108 120 132 144