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tbf there isn't much use with them
MS - memory store. say, you type a number. and you click MS, you have it saved there even when you click "C" ( the red C button)
M+, say you click a number 5 and you click M+, then this 5 is added to the number that we saved (MS).
M-, same application as M+
MR - you'll get final value, after you've done (M+) and (M-) as it directly gets stored in MS, this will help you bring it back.
MC - this thing clears our memory that we saved ( the one in MS)
basically you can't multiply shi with that.
Acshually there is a lot of use for them in some questions where you constantly gotta add and subtract values while remembering a number which is not supposed to be touched, however this might just be a thing for those like me who have a habit of not writing down the important details and do silly mistakes afterwards 🤓