Mathematics

It's so easy to get the multiples of 11.

11 x 11 = 121
12 x 11 = 132
13 x 11 = 143
14 x 11 = 154
15 x 11 = 165
16 x 11 = 176
17 x 11 = 187
18 x 11 = 198
19 x 11 = 209

See the trick?

For example... 12 x 11 = 1(3)2
The (3) is actually (1+2). Once you add the two digits, insert the result between them.

Next... 16 x 11 = 1(7)6
The (7) is (1+6). Then, insert the (7) between 1 and 6.

Get it? Hmm...