One thing that's interested me over the years was the childhood realisation that the nine times table "went up" one side, and "came down" the other.
It wasn't until I grew up and started trying to think about problems from different points of view that I stumbled across the fact that this situation is true for all number bases.
so, in hexadecimal, if you take the nine as being ten-1, the F times table looks much like the nine times table you had as a kid.
1 x F = F
2 x F = 1E
3 x F = 2D
4 x F = 3C
5 x F = 4B
6 x F = 5A
7 x F = 69
8 x F = 78
9 x F = 87
A x F = 96
B x F = A5
C x F = B4
D x F = C3
E x F = D2
F x F = E1
10 x F = F0
This can be quite a revelation for some people. Funnily enough, it works right down to binary.
1 x 1 = 1
10 x 1 = 10
okay, that was a poor maths joke, so now I'll just get my coat.
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