Lesson 1.2-Order of Operations, pg. 11

Objectives:To evaluate numerical expressions by using the order of operations.To evaluate algebraic expressions by using the order of operations.

Order of Operations

Step 1: Grouping symbols - Parentheses - Fraction BarStep 2: Evaluate all powersStep 3: Do all multiplication and/or

division from left to rightStep 4: Do all addition and subtraction

from left to right.

“Please Excuse My Dear Aunt Sally”

Ex. 1: Evaluate expressions.

1. 6 + 4 – 2 × 3 2. 48 ÷ 2³ × 3 + 5

Ex. 2: Grouping Symbols

3. (8 – 3) × 3(3 + 2) 4. 4[12 ÷ (6 – 2)]²

You try!

5. 15 + 3 × 2 6. 4(11 +7) – 9 × 2

Fraction Bars

7. 2 6 2

3 5 3 2

5

3

Your turn….

8. ( )4 3 5

9 3

2

Ex. 4: Evaluate each expression if g=4, h=6, j=8, and k=12.

1. hk – gj

2. 2k + gh² - j

3. 2g(h –g) gh - j

A computer store has certain software on sale at 3 for $20.00, with a limit of 3 at the sale price. Additional software is available at the regular price of $9.95 each.

a) Write an expression you could use to find the cost of 5 software packages.

b) How much would 5 software packages cost?

SummaryStep 1: Grouping symbols - Parentheses - Fraction BarStep 2: Evaluate all powersStep 3: Do all multiplication and/or division from left to rightStep 4: Do all addition and subtraction from left to right.

NBA #2, pg. 14, problems 16-40 even & #31