I explained to a teacher one time this as my method, the get to ten version, and she looked confused as hell like why would anyone do that. She was cool with it though, gave me a whatever works for you kind of response.
Intellectuals, apparently: easy math
You, with ADHD: I like my easy math with an extra step or two
Me, literally clinically insane: preeeeeetty sure I find a way to solve that using the factorializing of transfinites and [TREE]3 somehow, maybe not
Googologers: HOLD MY UN/COUNTABLE INFINITIES, BITCH
This kind of feels like how I constantly get the "which word/shape/number (etc.) in this series is incorrect" questions on tests wrong. I severely overthink it. "Well, these four all have chloroplasts and this other one gains energy from photosynthesis via a symbiotic relationship with another organism, so it must be that one."
*Gets test back*
"Oh, it was the one that didn't live in a rain forest."
Okay this is nice and all but how do people do 3974* 438 mentally, without paper? And bigger and some outright freaks seem to do it in an instant
For me:
3974 * 438 -> 4000 * 438 - 26*438 ->
4000 * 438 - 26*440 - 26*2 -> 4000 * 438 - 20*440 - 6*440 - 26*2
And so on, and I'd do some of the intermediate calculations as I go (e.g. 20*440 and 6*440).
But that's only really needed if I need a precise answer. If I can get away with an estimate, I'll simplify it even more:
4000 * 430 ~= 43 * 4 * 10000 = 86 * 2 + 10000 = 1,720,000
Actual answer: 1,740,612. 4000 * 440 would be easier (I like multiplying 4s), but I know it would overshoot, so I round one up and the other down. Close enough for something like estimating how much a large quantity of something kind of expensive would cost (i.e. if my company gave everyone a hot tub or something).
I like the way the second ADHD method is also a flip on the "seven ate nine" dad joke
9+7=10+7-1=16
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