Math 150 – Fall 2015
Order of Operations
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Order of Operations
Please Excuse My Dear Aunt Sally
PE | MD | AS
1. P – Parentheses: First calculate the inside of any parentheses.
2. E – Exponents: Calculate the Exponents
3. MD – Multiplication & Division: do all the multiplications and divisions in order
from left to right. Note that
a ÷ b · c = (a ÷ b) · c =
ac
a
·c=
b
d
4. AS – Addition & Subtraction: do all the additions and subtractions in order from
left to right.
a − b + c = (a − b) + c
Example 1. Evaluate the following:
1. 15 ÷ 3 · 4 + 3 ∗ 2 − (−22 + 5)2 + 3
2. LC #11