- Perform operations in parentheses.
- Find the values of numbers with exponents.
- Multiply or divide from left to right in the order it appears in the problem.
- Add or subtract from left to right in the order it appears in the problem.
Why is this important?
2 x 32 = 2 x 9 = 18 without PEMDAS you could get 2 x 3 = 6 and square it to get 36!
2 + 3 x 15 = 47 without PEMDAS you could answer 5 x 15 = 75!
Following PEMDAS gets you the correct, expected answer.
Note: In Canada and the UK, they say brackets instead of parentheses. In the UK they say orders instead of exponents. “Brackets, Orders, Divide, Multiply, Add, Subtract”
(source – source links are NOT meant to be clicked/used.)