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I think calculators should have "into" and "from" so you can do division and subtraction on the previous result without retyping it. I made a demo: https://fluent-calc.vercel.app/

Also supports saving a result into a variable for later reference, and x "as proportion of" y, which is just an alias for division.

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Maybe you could do the same thing by having a negation and reciprocal button?

Yeah, having dedicated operators for going the other way just fit my mental model better for the types of tasks I had in mind for it.

Hmm, well then maybe it would be simpler to have a single button that swaps the input and the accumulator?

into and from may be easier for the average joe to read though

RPN calculators have that (swap button).

Yes, I use those all the time for exactly that purpose. In many cases you don't even need to worry in which order to enter the operands when calculating a difference or ratio, just press negate or reciprocal if the result doesn't look right.

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