1-2 Order of OperationsGoals

Use order of operations to evaluate expressions

VocabularyOrder of Operations – the process used to

simplify math expressions systematically

PEMDASPlease Excuse My Dear Aunt Sally

P – Parenthesis

E – Exponents

M, D – Multiplication and Division

A, S – Addition and Subtraction

Examples1. 4 + 3 · 2 – 6 ÷ 32. 8 ÷ 2 + 4 · 63. 3 · 42

4. 2(4 + 8) – 9 5. 24 – 8 + 66. 15 ÷ 3 · 27. 16 + 4 ÷ 2 – 3 8.

8284815221015½

Examples with variables1. 3x2 + 1 when x = 42. 32 ÷ x2 – 1 when x

= 43. 3(x2 + 1) when x =

24. 4x3 + 1 when x = 35. when x = 9

491151095

PracticePage 12 #1-12

Word Problem #1Suppose you live in a state that charges no sales tax on essentials, such as clothes or food, but charges 6% sales tax on nonessentials, such as CDs or games. You decide to buy a sweatshirt for $24 and a video game for $39. What is your total bill?

$65.34

Word Problem #2According to the California Department of Forestry, an average of 539.2 fires each year are started by burning debris, while campfires are responsible for an average of 129.1 each year. How many total fires would you expect there to be in five years?

3342 fires

More PracticePage 12 #13 and 14

HomeworkPage 13 #16-34 even

#40-48 even #37 and 55