21st Century Lessons

Evaluating ExpressionsOrder of Operations 2

1

Warm Up/Do Now

Agenda

2

Evaluate:22050

2

12050 1) 2)

3) What do you notice about the answers to #1 and #2?

40 40

What do you think caused that?

Dividing by 2 and multiplying by one-half give the same result.

OBJECTIVE: SWBAT evaluate expressions using the order of operations.LANGUAGE OBJECTIVE: SWBAT identify and correctly use the mathematical vocabulary: expression and evaluate.

Agenda:

1) Warm Up 2) 1st Launch

• Mini Summary

6) Assessment/3-2-1

3

Independent

OBJECTIVE: SWBAT evaluate expression using the order of operations.

LANGUAGE OBJECTIVE: SWBAT identify the words expression and evaluate.

Independent

Multiplication/Division?- Whole Class and Partners

3) 2nd Launch

5) Practice

• Wrap Up

• Example • Quick Note

• Summary

Partners

Whole Class

Whole Class

Addition/Subtraction?- Whole Class and Partners

Whole Class

Complete the Phrase- Partners

Complete the Phrase- Whole Class

• Mini Summary Whole Class

Whole Class 4) Practice

Agenda

1st Launch-Multiplication/Division?

4

You have learned that there is an order to evaluating expressions correctly. Today you will be learning some important ideas about the order.

2) Now evaluate the expression using the correct order.

1) What are the three operations in the problem?

Look at the expression below

Order of Operations

52204

Agenda

6

52204 What is your answer?What order did you use?

Online

Calculator

×𝑜𝑟 ÷?So…..What do we do first, multiplication or division?

Order of Operations

4 54

Possible Answers

1050

54

1st Launch-Multiplication/Division?

Agenda

8

The rule is when you have multiplication and division, in the same expression, you evaluate whichever comes first: Ieft to right.

Multiplication is done first Division is done first

Mini-Summary

Lets look at 2 examples.

93616 a) 541232 b)16 9 32 5

Optional Proof

ORDER OF OPERATIONS

1) Parenthesis or Grouping Symbols

2) Exponents

3) Multiplication/Division

4) Addition/Subtraction

18 3

Agenda

10

1) What are the three operations in the problem?

Look at the expression below

Order of Operations

2) Now evaluate the expression using the correct order.

211020

2nd Launch-Addition/Subtraction?

Agenda

2nd Launch-Addition/Subtraction?

12

211020

+𝑜𝑟 −? 10202

So…..What do we do first, addition or subtraction?

Order of Operations

You evaluate whichever comes first: left to right.

Online

Calculator

What is your answer?What order did you use?

Possible Answers

21012

Agenda

14

The rule is when you have addition and subtraction, in the same expression, you evaluate whichever comes first: Ieft to right. Just like multiplication and division

Addition is done first Subtraction is done first

Mini-Summary

Lets look at 2 examples.

5610 a) 21032 b)5 2

Optional Proof

ORDER OF OPERATIONS

1) Parenthesis or Grouping Symbols

2) Exponents

3) Multiplication/Division

4) Addition/Subtraction

16 22

Agenda

Launch-Wrap Up

16

Open to your notes.

The Order of Operations1) Parentheses or Grouping Symbols2) Exponents3) Multiplication/Division

4) Addition/Subtraction

from left to right whichever comes first

from left to right whichever comes first

( )( )

New Understanding

Agenda

5.36

Practice- Example

17

Practice with your partner. Evaluate the expression.

5.1233055 5.12555.155

5.1

5.36AnswerProve the answer by showing your steps.

1020

35

Agenda

Practice- Quick Note

18

In Mr./Ms. (Insert teacher’s name)7th grade math class,

5.1233055 this problem will be written another way.

For the rest of the lesson, and year, you will see this new way of writing multiplication. So be ready!!!!

7th grade way

What is different?33055 5.12

Agenda

Practice- Complete the Phrase

19

4310 2 3. 13 * LOVE

18 * VAMPIRE86 * THE8 * FANGS2610 1.

4330 2.24 * WITH

20 * IN

58 * DOOR

8 * BLOOD

5260 3 7.241632 8.262450 9.

12 * GOBLIN

70 * ABOUT81* GIRL

13 * WHO83 147 12.

2)54( 10.2338 3 11.

81 * SPOOK8 * FELL66 * THE29 * NECKS4965 6.

2544.2)610( 5.

Name_____________________________ Date____________CLASSWORK: ORDERS OF OPERATIONS LESSON 2

DID YOU HEAR…….Directions: Evaluate each expression in each box and find your answer in the column to the right. Write the word next to the answer in the box containing the problem number at the bottom of the page. For each set of exercises, there is one extra answer.

SHOW YOUR WORK/STEPS BELOW

Agenda

Summary- Complete the Phrase

20

Do you need to see the work for any of the problems?

3.

1.2. 5260 3

7.8.

241632

262450 9.

83 147 12.

2)54( 10.2338 3 11.

4965 6.

2544.2)610( 5.

4310 2

2610 4330

Click any expression to review

Click here to reveal the answer to the riddle.

Agenda

Assessment- 3-2-1

34

Complete the 3-2-1 below:

things you have learned today.questions you still have.

expression to evaluate.

321

425337 38

Agenda