PEMDAS :

PEMDAS stands for parenthesis, exponents, multiplication, division, addition, subtraction. PEMDAS tells you the "order of operation" when there are two or more operations in a single expression. The order of letters in PEDMAS would guide what to perform first, second, third and so on. As the original acronym is quite difficult to remember, its turned into phrase "Please Excuse My Dear Aunt Sally."

Example :