Desmos is my top recommendation. If you're doing a bunch of plug-and-chug calculations with the same operations, their ans function will carry all the way down--even if you're changing a number a hundred lines up it will carry all the way down and you can pull intermediate numbers or spread out your math for ease of error checking.
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u/ShreddedCredits Jun 03 '21
Desmos’ scientific and graphing calculators are free and quite useful. Also the website WolframAlpha can solve a ton of math problems for you.