1. Unit 1. Day 1.

2. 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)

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

4. 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?

5. 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

6. 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!

7. 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

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

9. Example B*: Find the value of the expression6
6−4÷2+7∙3 − +
7∙3 2
6 − 2 + 21 4
+ 21
P E
M A
D S 25

10. 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

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