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In Germany you usually learn up to 10×10 in school and there are usually 10 eggs in a box (4, 6 and 25 are also common sizes though and there's also a big set t
by legulere 11y ago
In Germany you usually learn up to 10×10 in school and there are usually 10 eggs in a box (4, 6 and 25 are also common sizes though and there's also a big set that's 20×20 which you don't usually learn though)
> And when you want to raise standards in math, then who could argue with that?
The problem is that you can only spend so and so much time with children in class. Learning 12×12 is 80% more combinations to learn compared to 9×9. That's time you could teach them something else that might be more useful.
- kijin 11y agoActually, it's only ~32% more combinations to learn, because nobody really needs to memorize the 10's and 11's (except 11 x 11). You memorize all the combinations up to 9 x 9, compute the 10's and 11's on the fly, and memorize the 12's. Edit: Corrected the number. This is how you get 32%: The 9 x 9 multiplication table contains 8 x 8 = 64 combinations to memorize. The 1's don't count. The 12 x 12 multiplication table contains an additional 20 combinations to memorize, namely: - 10 combinations from 12 x 2 to 12 x 12, not counting 12 x 10 - 9 combinations from 2 x 12 to 11 x 12, not counting 10 x 12 - 11 x 11 = 121 So the total is 84 combinations, which is ~32% more than 64.