if you are using an algebra calculator you press, 2nd, +, 7, 1, 2 enter
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Memory Store. Save the displayed value in the memory.
Memory. It's the button that saves your current number, and when you press MRC, or Memory ReCall, the number is restored, giving you a great way to add two products if you have a basic calculator, or to do otherwise impossible equations that have many separate parts.
Both Windows and Apple computers come with a free calculator. The Windows calculator also includes a scientific calculator and programmer's calculator.
Why do you need a calculator?
It depends on the calculator. It could be "Rnd".