1. Section 1-5
Order of Operations

2. Section 1.5 Vocabulary
numerical expression – a combination of numbers and operations.
Example: x 5
order of operations – the rules which tell which operation to perform first when more than one operation is used.
Please Excuse My Dear Aunt Sally
Parentheses
Exponents
Multiplication/Division
Addition/Subtraction

3. PEMDAS Please Parentheses Excuse Exponents My Multiplication
Dear Division
Aunt Addition
Sally Subtraction

4. Example 1
Find the value of the expression 6+3x9.

5. Your Turn
Find the value of the expression 3+5x9.

6. Example 2
Find the value of the expression 4+(10-3).

7. Your Turn
Find the value of the expression 21-(6+9).

8. Example 3
Find the value of the expression 90 : 3+(3-2)-20.

9. Your Turn
Find the value of the expression 85 : 5-(12-8)-14.

10. Example 4
Find the value of the expression 4³+5x2-1.

11. Your Turn
Find the value of the expression 3⁴ +24 : 8-20.

12. Example 5
Find the value of the expression 49 : (2²+3)x3.

13. Your Turn
Find the value of the expression 64 : (4²-8)x9.

14. Example 6
MONEY Trina, her parents, and her grandmother eat dinner at a popular diner. Each person orders a soda, sandwich, fries, and dessert. Find the total cost of the meal without tax.
ITEM
COST
SODA $1
SANDWHICH $5
FRIES $2
DESSERT $3

15. Your Turn
CLOTHING Maris is shopping at a new clothing store. T-shirts are priced at $9 each, jeans are priced at $17 per pair, and sweaters are priced at $14. Maris buys 4 t-shirts, 2 pairs of jeans, and 3 sweaters. Find the total cost of her purchases without tax.

16. Assignment
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