A to Z Blogging Challenge - Numbers (not the TV show)

I love numbers. I like adding and finding patterns and tricks. I love how all multiples of nine add up to nine, or another multiple of nine and so on (eg. 9 x 9 = 81, and 8 + 1 = 9). I also love Pi, but i'll save that for another day. I also love the numbers 1, 13, 42, 73 and 118.141 for no real reason.

Friday 13

Since today is Friday the 13th, I might aswell go pat my black cat under a ladder with a broken mirror