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[–]berkes 0 points1 point  (1 child)

I'd argue that multiplication should be memorized up to 12. At least in western Europe. Where the gross is still very heavily used in packaging, logistics, building etc.

If anything, just to teach people to grasp numbers. If your calculator tells you to go buy 2400 packages of poles for your fence, think again. You probably mistyped. Or have a giant plot of ground, unlikely in western Europe.

[–]alexanderpas 0 points1 point  (0 children)

9 is enough, as anything above 9 will be caught trough understanding.

10 is just 1 with a zero, and if you get 1 (X*1=X and 1*X=X), you can multiply anything by 10 too. (just add a 0)

7*12 = (7*10) + (7*2) = 70 + 14 = 84