>>16918084
India and underage

Bigger numbers harder, simple as

>>16918084
>"table of 8"
>See rightmost digit (units place)
>8, 6, 4, 2, 0, 8, 6, 4, 2, 0

I've always struggled with table of 7, not so much with 8

>>16918087
But 9 is one of the easiest since the sum of the numbers always add up to 9 and the digits of the multiples of 9 have a very simple pattern where the first digit increases while the second decreases.

>>16918792
9 is close to 10, the base of the system

>>16918101
7 is definitely understandable because it is the first prime without such a simple repeating pattern to the digits of its multiples.

>>16918084
I learnt that shit in first grade. Are you retarded?

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>>16918084
>expand 7*x to 4*x + 3*x

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mathematician here

every time I'm asked to mentally multiply something I start skip counting with my fingers

>>16922108
for me it's 10x - 3x