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MR is Memory Recall

MC is Memory Clear

M+ is Memory add

M- is Memory subtract

These are used to add and subtract the answers to multi-step equations so you can do the small steps with the calculator, then store, change or recall the total as needed. You might add a long string of numbers in groups this way. Or you can do all operations in one parenthesis, then just store the total of each.

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∙ 15y ago

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