Memory
so if you want to save or add a number to your memory you would use M+
if you want to subtract a number from memory you would use M-
if you want to recall that number you would use MR
and if you no longer need to save that number you would use MC
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memory/recall
Sto on the calulator means it will save the number in the memmory then pres m to get it back
Input is when you type with the calculator
What does 4e-6 mean
You can subtract whatever number you have entered into memory.