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What hills are you dying on?
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I find it easier to just add/subtract 12, the problem is that I sometimes accidentally add/subtract 10.
Yeah, I knew about that trick, but for me, it was easier to just break down 16 into its smaller components. Or remember that 19 was a prime, which belonged to 7. After a bit of time (heh), it all just started to meld for me. Nothing like immersion-based learning!