1. Lesson 1.3: Order of Operations
Essential Question: How do you use Order of Operations to evaluate equations?

2. Key Vocabulary
Order of Operations: the rules of which calculation comes first in an expression.
Please Excuse My Dear Aunt Sally

3. Example 1
Evaluate the expression when x=4
a. 3x²+1
b. 32÷x²-1

4. Example 2
Using Left to Right Rule
a =
b. 15·2÷6=
c. 16+4÷2-3

5. Example 3
Evaluate the expression using a fraction bar
7∙4 8+7²−1

6. Example 5: Calculating Sales Tax
You live in a state that charges sales tax on non essentials, such as CDs or games, but does not charge sales tax on essentials such as clothing. You decide to buy a sweatshirt that costs $24 and a video game that costs $39. What is the total cost of you shopping trip?
(cost of sweatshirt)+ (cost of video game · .06)