I need to keep a track for delivery orders, because our mean boss always guards his sale number as national top secret. At first I wrote them down on a piece of paper, but that's not the way for highly intelligent person such as me to steal business secret. So when I found out the memory function button on my calculator, I was very excited about it (Please don't laugh at me.). So the MRC is short for Memory ReCall, M+ is for adding to the memory, and M- is for taking away from it.
Sometimes I have to leave my calculation half way to deal with something else, I just press the M+ button, to save the sub total to memory, and come back to it later.
Press MRC twice to clear the memory, press once to recall the memory.
Sometimes you input a number, or even add up a lot numbers already, but you forget press the plus button, a disaster indeed, because you press a big number with decimal point after the sub total so far , but you can't remember what it is. Now you press the RIGHT ARROW button, to go back. For example, you input 31.56, press four times to cancel it.
Your calculator may haven't a Euro conversion button, I have also token long time to find out how to set the rate, which is press and HOLD the rate set button for couple of seconds (I don't know how many second.), then input a number and press the Rate Set button again.
It seems a tradition to design the key to function like this, such as power button on a computer to force shut down, on Amazon Kindle you hold power slide for 20 seconds, and press the Home button for 1 minutes, then you have an option to reset your kindle.
Of course if you bought the calculator yourself and still keep the instruction, you can always read it whenever you're puzzled by these buttons, but I don't think many people have the habit of keeping user manuals or instruction.
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