1.3 Order of Operations

Today’s Objective

Use the order of operations to simplify expressions.

Today’s Schedule

1. Dividing Decimals Review

2. Warm Up

3. Lesson and Checkpoint Exercises

4. Activity

5. Group Work – Real World Problems

Dividing Decimals

Rules for dividing decimals:

1. The first number goes “in the box”

2. The second number goes “out front of the box”

3. If there is a decimal in the number out front of the box, move it to

the end of the number

4. Move the decimal point in the number in the box the same

number of places

5. COPY THE DECIMAL POINT IN THE BOX STRAIGHT UP ABOVE TO

THE TOP OF THE BOX!

6. Write your answer AS A DECIMAL (with no remainder)

7. Keep columns lined up neatly!

1. Divide.

a) 0.980 ÷ 4 b) 6 ÷ 15 c) 5.22 ÷ 1.8

2. Divide.

a) 9.18 ÷ 3 b) 0.63 ÷ 0.7

c) 3.76 ÷ 0.8 d) $769.34 ÷ 6.5

e) How many nickels can Jeb get for $7.35?

Warm Up

W1. Evaluate the following expressions.

a) 3 ∙ 5 + 4 b) 3 ∙ (5 + 4)

c) 9− 3 2 d) 9− (32)

e) 4𝑤2 when 𝑤 = 5 f) 4𝑤 2 when 𝑤 = 5

1.3 Order of Operations

Mathematicians have an order of operations to properly evaluate algebraic

expressions with more than one operation.

Please Excuse My Dear Aunt Sally (or PEMDAS)

1)

2)

3)

4)

1. Evaluate each expression.

a) 32− 16 + 23 b) 48 ÷ 2 ∙ 3

c) 12 + 6 ÷ 3− 2 ∙ 5 d) 3(42 + 8) ÷ 4

On Your Own

Complete Checkpoint 1-4 on p. 15

C1. C2.

C3. C4.

2. Evaluate each expression when 𝑥 = 2.

a) 3𝑥2 + 1 b) 2− 𝑥3 + (12 ∙ 2)

3. Evaluate the expression: 24∙3

5+32−2

On Your Own

Complete Checkpoint 5-7 on p. 16

C5. C6. C7.

In Groups

Complete Checkpoint 8-9 on p. 17 (you do not need to explain, but your

answer needs to be in a complete sentence).

C8.

C9.

Extension Activity

Closing Questions

What was today’s objective?

Why is the order of operations useful in the real world?

Homework – p. 18 (17, 20, 23, 25, 27, 30, 33, 36, 39, 42, 47, 48, 54-57)

In your groups – work on #47-57