How to calculator?

[MoonKnightSpidey]

    This is a odd and generally pointless question but I have an inquiry about calculators. The particular one I am using is the windows calculator that comes built in, I assume this is true for all calculators but maybe it isn't so I thought I would include it. When finding the mean on the calculator how have to do something that I find a little odd. I will give an example.
    Set of numbers: 69, 66.6, 53.18008 and 69. I will tell two ways to do this.
       69+66.6+53.18008+69/5=202.58008

            Obviously this is incorrect HOWEVER if I do

       69+66.6+53.18008+69 EQUALS/ENTER /5=51.556016

           This is correct. Why do I have to hit enter? Wouldn't it do the same operation?
 

[Glenwing]

Order of operations.

 

What you're doing is adding 69, 66.6, and 53.18008 to one fifth of 69.

[MoonKnightSpidey]

I thought I would have to do (69/5) in order for it to only apply to that specific number?

 

Order of operations. It's dividing 69/5 and then adding it to the other numbers in your first example. PEMDAS. Division comes before addition so you have to put all the numbers in the numerator in parenthesis or add them up before dividing by 5

[Enderman]

I thought I would have to do (69/5) in order for it to only apply to that specific number?

no, your calculater is smarter than that and follows BEDMAS

brackets, exponents, division and multiplication (from left to right) and addition and subtraction (again from left to right)

so if you want it to not follow this rule you need brackets around the addition so that it does that first, because brackets come before division

[Glenwing]

I thought I would have to do (69/5) in order for it to only apply to that specific number?

 

No, that's the default behavior. You need to do (a+b+c+d)/5 to not get it to apply to that specific number.

[MoonKnightSpidey]

Nope. In Math it will always divide and multiply before you add.

 

It goes:

 

Parenthesis

Exponents

Multiplication

Division

Addition

Subtraction

 

(A+B+C+D+E)/5 is what you want

New subject! What did your teacher tell you to use to remember PEMDAS? Some shit about my mother making pizza. 

[MoonKnightSpidey]

Well, PEMDAS is one of them.

 

But I used "Please excuse me doing a strip"

Oh my, what school did you go to...

[Art Vandelay]

Buy an HP reverse polish calculator or use brackets