Unit 1. Day 1.

Normal Math Class (49 minutes) Quiz [Have homework on desk. I check HW] (10 min) Quiz answers (5 min) Review Homework: ASK QUESTIONS (4 min) Lesson (30 min)

Please get out paper for today’s lesson Name Date Period -------------------------------------------------------- Topic: Order of Operations

When I was in 7th grade… 3+4∙2 What do you think my answer was? I put 14 as my answer. But my teacher told me I was wrong, which made me mad! He said the answer was 11 … why?

Order of Operations + − × ÷ 𝑥 2 From now on, you must always follow a particular order when making math computations. We simplify the inside of Parentheses Compute the Exponents Multiply and Divide (from left to right) Add and Subtract (from left to right) + − × ÷ 𝑥 2

Not exactly accurate! Order of Operations Parentheses or [ ] P E Exponents 𝑥 2 × ÷ Multiply and Divide (from left to right) M D + − A Add and Subtract (from left to right) S Not exactly accurate!

Multiply and Divide (from left to right) M D Order of Operations Parentheses or [ ] P 𝑥 2 E Exponents × ÷ Multiply and Divide (from left to right) M D + − A Add and Subtract (from left to right) S

Example A: Find the value of the expression 4+3∙5 4+ 15 19 P E M A D S

Example B*: Find the value of the expression 6 6−4÷2+7∙3 − + 7∙3 2 6 − 2 + 21 4 + 21 P E M A D S 25

Example C: Find the value of the expression 2∙ 3 2 − 4+21 ÷5 2∙ 3 2 −25 ÷5 2∙ −25 ÷5 2∙ 3 2 − ÷5 25 9 18 − 25÷5 18 − 5 P E M A D S 13

Example D*: Find the value of the expression 12+2∙ 4 2 − 4÷2+5∙6 + 2 3 12 + 2 ∙ 4 2 − + 5∙6 + 2 3 2 12+2∙ 4 2 − 2 + + 2 3 30 12+2∙ 4 2 − + 2 3 12+2∙ 4 2 − 32 + 2 3 32 12+2∙ − 32 + 2 3 16 12+2∙16− 32 + 8 12+ − 32 + 8 32 P E M A D S 44 − 32 + 8 12 + 8 20