Does PEMDAS mean that multiplication always goes before division, or is it whatever comes first in the problem? Same for Addition and Subtraction.
PEMDAS = parentheses, exponents, multiplication, division, addition, subtraction... (in that order) from left to right in the equation
yes, multiply goes before divide, and add is before subtract,
pemdas is not just parentheses, exponents, multiplication, division, addition, subtraction, it can also be:
Please Excuse My Dear Aunt Sally
THAT IS NOT QUITE CORRECT
Multiplication and division are equally important. You do these left to right.
Addition and subtraction are equally important. Again do this from left to right.
NO.....NO....NO.....folks !!! What Melody says is correct.....!!!!
The "Parentheses" and "Exponents" part is correct.
But, multiplication and division are done at the same level of precedence........this means that we perform whichever of these comes first as we move from left to right....!!!!
20 ÷ 5 x 2
It is incorrect to multiply 5 x 2, first, and then perform the divison second. This results in an answer = 2.
The correct order is to divide the 20 by 5 and then multiply this result by 2 = 8. Note that this is quite different from 2 !!!!
Addition and subtraction are also performed at the same level of precedence, but these usually don't cause too much of a problem. It's usually the multiplication/division that give people trouble.......