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IMO measurements are actually one of the few areas in life where we are living in a decent timeline because US Customary is basically an affine rescaling of SI Units (affine but not linear because (at least) of x [K] = (x [°F] − 459.67) × 5/9) with exact conversion factors if you're careful. And then my personal preference for the units I was socialized under become irrelevant for practical work.
5/9 is close enough to half for most purposes, and 30 is close enough to 32 - you can be within a reasonable margin of error converting to F/C with much easier math. Sure it isn't perfect, but most of the time you don't need that accuracy in the first place.
No thank you, I like hard math. I didn't learn all this math to not use it 😆
Just make sure you don't get too many significant digets in your answer and so get the wrong answer.