I found a 10 second sanity check that catches most calculator typos

I do a lot of estimating for side jobs, and I kept catching numbers that were way off after I'd already quoted someone. Last month I started doing this quick trick: after I punch in a big multiplication, I round both numbers in my head and see if the answer is in that ballpark. For example, if I type 47 times 82, I know it should be near 3,760, so if my calculator says 3,184, I know I fat-fingered something. It sounds dumb but it's caught maybe 4 mistakes in the last 3 weeks, one of which would've been a $500 error on a duct job. Has anyone else got a low-effort check that keeps their math honest before they send a quote? I'm curious if there's a better habit than just re-typing the same numbers.

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