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I do 9 x 14 in my head by breaking it down. I assume others do this too. Anyone should be able to break a problem down (pre or post tech generation) and do the
by w8rbt 11y ago
I do 9 x 14 in my head by breaking it down. I assume others do this too. Anyone should be able to break a problem down (pre or post tech generation) and do the small parts, then put them together to answer the bigger question.
In general, that's the essence of learning. If we stop teaching that, then we're all in trouble ;)
9 x 10 = 90
9 x 4 = 36
90 + 36 = 126
- gambiting 11y agoHa, very interesting, I do something very similar, although for multiplication by 9 I would multiply by 10(since it requires no mental effort, you just add a zero at the end) then subtract one. So: 14 x 10 = 140 140 - 14 = 126