What do MC, MR, MS, M+, and M- in calculators do?

MC, MR, MS, M+, and M- are commonly found on calculators and are used for memory functions:

• MC (Memory Clear): Clears the memory.
• MR (Memory Recall): Recalls the value stored in the memory.
• MS (Memory Store): Stores the displayed value in the memory.
• M+ (Memory Add): Adds the displayed value to the value already in the memory.
• M- (Memory Subtract): Subtracts the displayed value from the value already in the memory.

These functions are useful for temporarily storing values during calculations.

The buttons can be handy for doing repeated calculations with a single number. For instance, if you wanted to multiply a bunch of numbers by pi, you could key in the following:

3.14159.. MS (stores the number)
4 x MR = (gives you 4 times pi)
25 x 25 x MR = (gives you 25x25 times pi)

The M+ button can be handy for figuring out complicated expressions if you don't happen to have a scientific calculator. For example, to calculate (5 x 6) + (12 x 2) + (3 x 7), you can do the following:

5 x 6 = (calculator says 30)
MS (stores 30 in memory)
12 x 2 = (calculator says 24)
M+ (takes 24, adds it to 30, stores result 54 in memory)
3 x 7 = (21)
M+ (takes 54, adds 21, stores the result 75)
MR (displays the result 75)

I think it will help you.