Something fucking cool I just realized while lying awake in bed tonight

[borkos_livejrnl]

Multiples of 9

18: 1 + 8 = 9
27: 2 + 7 = 9
36: 3 + 6 = 9
45: 4 + 5 = 9
...

I knew this already. What I didn't know:

99: 9 + 9 = 18: 1 + 8 = 9
108: 1 + 0 + 8 = 9
117: 1 + 1 + 7 = 9
126: 1 + 2 + 6 = 9

!!!

162: 1 + 6 + 2 = 9
...
189: 1 + 8 + 9 = 18: 1 + 8 = 9
198...207: 2 + 0 + 7 = 9...216...225...234...
9!

fucking maths eh

fuck I've had too much caffeine today