# Boards

## M+ , M- and MRC on a calculator

what the fuck do these mean? and do they actually do anything?

i've never known.

thanksbye

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what the fuck do these mean? and do they actually do anything?

i've never known.

thanksbye

## memory

so you can save values

## ...

just get a proper scientific calculator, they're awesome fun

## what was it you were saying about how irish edcucation is better?

## She's destroying all the stereotypes.

## yes. as we used our heads, not calculators.

at least till we got till the age of 16 and used calculators for difficult calculations/formulas.

## Most kids probably had calculators from the age of 11?

Maybe earlier.

BOOBLESS!!!

## BOOBS

## it was more fun making the scientificy ones

say COCO POPS

## I can write "FUCK YOU! TWAT BASTARDS" on mine

## BOOBIES

## the fuck?

we weren't allowed to use them till our Leaving Cert.

## Yup. Put 55378008 into the memory.

Then type .7734 in and tap the shoulder of the girl sat at the desk in front of you. Show them the calculator, upside down. Watch them smile. Press MR.

## HELLO

## *smiles*

## ps. i notice that you didn't actually answer the question.

you didn't know, did YOU

## BOOBS

## BOOBLESS

## M+ adds that value to memory

M- takes the value away.

MC cancels the memory and MR recalls it. Useful for storing the results of one calculation to retrieve for a later one or for totally up the values from a series of calculations.

My last calculator (bought in 1997) has six extra memories for more fun.

## Are you serious?

M = memory,

M+ saves numbers so that they can be recalled (MR) in subsequent calculations, and M- clears the memory

## Also, you know the difference between C and AC, don’t you?

## I hope you re-read that and realise you made a typo

Rather than actually meaning to write that.

## That’s how it works on my calculator. It’s a really old one, mind.

## M- should be minusing to the memory.

If you put 9 M+ and then 9 M- yeah it would mean the memory goes away but otherwise it shouldn't work that way.

## yes!

i've never used basic calculators for more than adding/multplying/dividing and i've never had need to use those M buttons. and no one has ever told me what they were.

## until more people say they know this, i shall assume i am the majority.

especially as one of the people is Theo, and obviously he would effing know.

## What the fuck? My MUM knows what they're for.

Everyone who's ever used a calculator knows, apart from you and a few luddite grannies.

## I knew what these were for

I just didn't bother replying to the thread, because... well, y'know.

## "well, y'know."

Worst sign off to Sarah you can really do? :D

## WHY ARE THE BUTTONS NEEDED

i've never used them, ever.

## I wasn't taught until college

And I'd forgotten the specifics until reading Theos post.

## I know this.

It is known to me.

## i've been fiddling with my calculator

and still don't get why these buttons are needed.

## Well hey, how about this.

I have to do the square of one side of a right angle triangle and the square of the other side and then add them together and get the root of that.

Early calculators didn't have bracketing and also may not even have been able to perform basic multiply/divide/addition/subtraction in the right order so if you tried to do:

(side length x side length) + (other side length x other side length)

the only way you could do it was to store the first calculation in the memory and then do the other one and add it to the memory value before doing the square root.

Something like that.

## see, when i was at school

we had to do that on paper, all written out.

so i've never had need to use those buttons.

and now all i use them for are basic calculations!

## Well that's good. Personally I couldn't tell you the square root of 784.

And I'd rather have a way to check my calculations are right if I'm doing a scientific experiment that relies on several values.

## yeah but i'm sure at the age of 11

i probably knew some formula to figure that out.

and when i was allowed a real proper calculator, it had the specific 'square root' button so...

## What happens if you want to find out the following:

A + B

where A = the result of some long and laborious calculation that runs to eight digits and B = the result of another long and laborious calculation that runs to eight digits.

Do you write them all out on a piece of scrap paper? It’s a lot easier to press M+ and then MR when needed.

## Also

If you have you (Casio?) calculator in SD (standard deviation, i.e. stats mode), you can bung a sequence of numbers into the memory and then use summats like S-VAR to get the variance of those numbers. You can also retrieve other statistical data from that sequence.

Exact details are flaky. It's been over 10 years since I used that shizzle for A-Level Maffs/Phyzix.

Basically, RTFM.

And if you don't know what RTFM is, Google it, innit?

## Can someone find the link to the iPhone thread pls?

## * And if you don't know what RTFM is, JFGI

## I'm less sure after reading marckee's post.

I don't have my calculator with me to double check either.

## AHA

so, like fuck you mr. knowitall

## Hey, I'm almost certain that's what it does on my calculator.

I don't know if that means it's universal on all calculators but I knew what the fuck M was, doofus.

## You know the difference between 'C' and 'AC' though?

yes?

## *sigh*

not really.

## ...

AC = All Clear. This clears all numbers and functions.

C (or CE) just clears the most recent input.

So, for example, if you wanted to calculate 4+5+6+7 (22), and you accidentally typed, ‘4+5+6+8’, you could press C and it would clear the ‘8’, allowing you to enter the ‘7’ and continue. It just means that you don’t have to go all the way through a lengthy calculation if you make a typo.

## I’ve just dug my calculator out, and it has a ‘Min’ button instead of a ‘M-‘ one.

And ‘Min’ wipes the memory.

Thinking about it, I’ve used calculators which had M- on them in lieu of Min and it required a double press to clear the memory, which would suggest that Theo is right, as it was subtracting itself equalling zero.

## Woohoo. IN YOUR FACE, FOX!!

## Wow

Just wow, Sarah.

On the topic of calculators, I have one that I need to get rid of, it draws graphs in 3 different colours and allsorts of other stuff for use in further maths.

Anyone obsessed with maths and stuff want to buy it? It's a long shot, but you know.

## I knew they meant 'memory' but that's about it