this post was submitted on 04 Apr 2025
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Is that a weird method of doing math?
I mean, if you give me something borderline nontrivial like, say 72 times 13, I will definitely do some similar stuff. "Well it's more than 700 for sure, but it looks like less than a thousand. Three times seven is 21, so two hundred and ten, so it's probably in the 900s. Two times 13 is 26, so if you add that to the 910 it's probably 936, but I should check that in a calculator."
Do you guys not do that? Is that a me thing?
72 * 10 + 70 * 3 + 2 * 3
That's what I do in my head if I need an exact result. If I'm approximateing I'll probably just do something like 70 * 15 which is much easier to compute (70 * 10 + 70 * 5 = 700 + 350 = 1050).
OK, I've been willing to just let the examples roll even though most people are just describing how they'd do the calculation, not a process of gradual approximation, which was supposed to be the point of the way the LLM does it...
...but this one got me.
Seriously, you think 70x5 is easier to compute than 70x3? Not only is that a harder one to get to for me in the notoriously unfriendly 7 times table, but it's also further away from the correct answer and past the intuitive upper limit of 1000.
Times 5 and times 10 tables are really easy for me. So yeah, in my mind it's an easier comuptation.
That being said having a result of a little over a 1000 gives me an estimate for the magnitude of a number – it's around a thousand. It might be more or less but it's not far from there.