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What's the coolest mathematical fact that you know?

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daisymay · 51-55, T

9 is a magic number. If you take any multiple of 9 (18, 81, 162, etc.) and add those digits, you always get 9.

SweetMae · 70-79, F

@daisymay Wait! That is true. 9x9=81 8+1=9

greenmountaingal · 80-89, F

@daisymay Interesting! Thanks.

turbineman40 · 80-89, M

@daisymay amazing fact isn't it