The order of operations is something in math that is often committed to memory. To some, the order makes sense and to others, it's just a matter of remembering the order. There are many mnenomics devices that will help and my advice, is to use what works for you. Some people use PEDMAS, other use BEDMAS (Parenthesis/Brackets, Exponents, Division, Multiplication, Addition, Subtraction). I have also heard PEMDAS as Please Excuse My Dear Aunt Sally as a way to remember the acronym. To learn more about the order of operations, you may wish to see the full article here.