if it is a scientific calculator you just have to press replay at the top of the calculator
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Ah, the MRC button on a calculator is a handy little tool. It stands for Memory Recall, which means it brings back whatever number you stored in the calculator's memory. Simply press the MRC button after you've stored a number, and it will display that number for you to use in your calculations. Just like adding a happy little tree to your painting, the MRC button can add a touch of simplicity and convenience to your math equations.
memory/recall
MRC stands for Memory Recall.
Sto on the calulator means it will save the number in the memmory then pres m to get it back
There is no such number on a calculator. If you see "R" on a calculator, it is probably some calculation - for example, conversion from polar to rectangular coordinates. Check the manual for your calculator.