I have a question about math?

[dogsteeves]

I've been confused ever since I learned BEDMAS.
I know it goes
Bracket
Exponents
Divide
Multiplication
Addition
Subtraction
You. follow that formula
4-3+10÷5×2
4-3+2x2
4-3+4
4-7
= -3

But calculator say it's 5
I did addition before subtraction, like bedmas, is formed; the only way I get 5 is to subtract before adding.
Then why don't we call it Bedmsa if subtraction comes first?
Actually, why even have a word for it if it doesn't even matter?

[bean2k21]

If you taught it as PEDMSA it would still be wrong. Your error is that you worked the equation from right to left. The issue happens at 4-3+4, which is actually 5 because you treat subtraction and addition as the same order, and work them from left to right. The acronym should actually be taught as PE (MD)(AS), illustrating that in the order of operations you first deal with parenthesis, exponents then (multiplication and division) then (addition and subtraction). The second rule being you treat addition and subtraction with the same priority and work them from left to right.

[dogsteeves]

Why did we even make an Acronym anyways if it just confuses :P

I see it called Order of Operations but school has never called it that before every time I heard it was Bedmas and nothing more I just learned the real name today

[bean2k21]

Yeah, it's an order of operations acronym. Doesn't have anything to do with associative properties.

[Effably]

You could do it in the order you did and receive the correct result.

The core understanding is that -3 remains a negative. The minus is not only there to tell you what to do with the following number but to describe its actual value, which is negative. And so -3 4 will still come out as 1.

By keeping the full value your cheat-sheet should work for at least this equation. I never heard of any of these before. We just bash our head against mathematical problems until the logic becomes intrinsic here.

[bigpauly]

Best I can do is step by step.
Do anything inside brackets first, exponents next, multiplication and division next, then adding and subtracting. Other than that it is in order left to right.
4-3+10÷5×2
4-3 + 2x2 (first step is to divide 10 by 5 since there are no exponents or brackets and it is the first time a multiplication or division shows up)
4-3 + 4 (next multiply 2 by 2 since it is the next option that includes multiplication or division)
1 + 4 (then subtract 3 from 4 since there are no more multiplications or divisions and this is the first addition or subtraction)
5 (last add 4 to 5)

[TheMajesticKing777]

It's PEMDAS

Perentesis
Exponent
Multiplication
Division
Addition
Substraction

[TheMajesticKing777]

I learned it pemdas but tbh math all seems like gibberish to me

[UniquelyBasic]

Yeah, I thought it was Pemdas too.

[dogsteeves]

I am Canadian we call (Brackets)

[TheMajesticKing777]

Fair enough

[UniquelyBasic]

You didn't subtract 4-3 it would be 1+4

[UniquelyBasic]

Seems weird

[dogsteeves]

But it says Addition then Subtraction

Why would I subtract first

[UniquelyBasic]

Maybe when its subtraction and addition you do it left to right. Not doing addition first.

[dogsteeves]

it is but I don't know why they gave us the name Bedmas or Pemdas or Bodmas or Bimdas or Bidmas
or whatever if the A and S can be swapped depending on the calculation why not just call it a named Algorithm and not Acronym