Does everyone know this already? Am I an idiot?
@jamie remember someone trying to sell this to me as a good idea in school. It's fine, but it being 12s... I couldn't really use it quickly.
I tweaked it to base 10.
Thumb stays as 1, thumb-to-fingertips 2-5, thumb-to-middle knuckle 6-9
have you been taking your socks off this whole time. ;)
it did the rounds in my school at the same time as this https://www.archimedes-lab.org/Maths2_Multiplication.html
@basil Interesting. Thanks for the link. Youngest is doing times tables now. Will see if that helps.
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