PE[color=#c51414] MD[/color] [color=#0a971e]AS[/color] or PE[color=#c51414] DM[/color] [color=#0a971e]SA[/color] or GEMA or PEMA what ever you call it, the order of operations is crutial to the study of arithmetic (mathematics). GEMA/PEMA come from the concept that Division is a form of Multiplication using reciprocals, and Subtraction is the addition of the opposite number.

Here’s what the initials stand for:[br]P: do parentheses first[br]E: do exponents second[br][color=#c51414]M: do multiplication third[br]D: do division fourth[/color][br][color=#0a971e]A: do addition fifth[br]S: do subtraction sixth[/color][br][br]But this list has an error! MD must be done equally from left to right as is true for AS.