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I just got a calculator, but no accompanying manual.  If you are good at using parentheses you can do the most complicated calculation in one go. If you are not so good, the memories A, B, … come in handy. But how do you store a number in memory A, and how do you recall what you have stored?

A student of mine showed me how:

To store in A: press the buttons SHIFT STO A.

To recall the content from A: press ALPHA A.