Answer :

P ⇒ Parenthesis
E ⇒ Exponents
M ⇒ Multiplication
D ⇒ Division
A ⇒ Addition
S ⇒Subtraction

Here is how I was taught to remember all the letters. (Please Excuse My Dear Aunt Sally)
anjalee
P.E.M.D.A.S  stand for:
Parenthese
Exponents
Multiplication
Division
Addition
Subtraction

Please Excuse My Dear Aunt Sally
If you can't remember P.E.M.D.A.S then you can remember it like this.

                             Hope this helps:)