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5 Minute Check. Complete in your notebook. 1 1. 3 x 12 3 2. 7 x 8 5 3. 6 x 15 2 4. 5 x 11. 5 Minute Check. Complete in your notebook. 1 1. 3 x 12. 5 Minute Check. Complete in your notebook. 1 1. 3 x 12 1 12 12

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5 minute check
5 Minute Check

Complete in your notebook.

1

1. 3x 12

3

2. 7 x 8

5

3. 6 x 15

2

4. 5x 11

5 minute check1
5 Minute Check

Complete in your notebook.

1

1. 3x 12

5 minute check2
5 Minute Check

Complete in your notebook.

1

1. 3 x 12

11212

3 x1 = 3 = 4

5 minute check3
5 Minute Check

Complete in your notebook.

3

2. 7 x 8

5 minute check4
5 Minute Check

Complete in your notebook.

3

2. 7 x 8

38243

7 x1 =7 = 3 7

5 minute check5
5 Minute Check

Complete in your notebook.

5

3. 6 x 15

5 minute check6
5 Minute Check

Complete in your notebook.

5

3. 6 x 15

51560

6 x1 =6 = 10

5 minute check7
5 Minute Check

Complete in your notebook.

2

4. 5x 11

5 minute check8
5 Minute Check

Complete in your notebook.

2

4. 5x 11

21122 2

5 x 1 = 5 =4 5

wednesday oct 23
Wednesday, Oct 23

Lesson 4.3

Multiply Fractions

multiply fractions
Multiply Fractions

Objective: To understand how to multiply fractions.

multiply fractions1
Multiply Fractions

At the end of this lesson you should be able to answer the following question.

If two positive fractions are less than one, why is the product also less than one?

multiply fractions2
Multiply Fractions

To multiply fractions, multiply the numerators and multiply the denominators, then simplify if needed.

Example x =

32 63

4 x 5 = 20 = 10

x =

multiply fractions3
Multiply Fractions

Multiply.

13

2 x 5=

Estimate?

Reminder – When estimating the product of two fractions, round each fraction to 0, ½ or 1 and then multiply.

multiply fractions4
Multiply Fractions

Multiply.

13

2 x 5=

11 1

2 x 2 = 4

Actual Product?

multiply fractions5
Multiply Fractions

Multiply.

13

2 x 5=

Actual Product?

133

2 x 5= 10

Is this a reasonable answer?

multiply fractions and whole numbers
Multiply Fractions and Whole Numbers

Multiply.

13

2 x 5=

Actual Product?

133

2 x 5= 10

31

Is this a reasonable answer? 10 ≈ 4

multiply fractions6
Multiply Fractions

Multiply.

25

3 x 6 =

Do this on your own.

multiply fractions7
Multiply Fractions

Multiply.

25

3 x 6 =

Estimate?

mumultiply fractions
MuMultiply Fractions

Multiply.

25

3 x 6 =

11

2 x1= 2

Actual Product?

multiply fractions8
Multiply Fractions

Multiply.

25

3 x 6 =

Actual Product?

25105

3 x 6 = 18 = 9

Is this a reasonable answer?

multiply fractions9
Multiply Fractions

Multiply.

25

3 x 6 =

Actual Product?

25105

3 x 6 = 18 = 9

51

Is this a reasonable answer? 9 ≈ 2

multiply fractions10
Multiply Fractions

If the numerators and denominators have a common factor you can simplify before multiplying.

multiply fractions11
Multiply Fractions

If the numerators and denominators have a common factor you can simplify before multiplying.

Example

25

3 x 6 =

All numbers are prime factors (which means they have no factors other than one and itself), except for 6. What are the factors of 6?

multiply fractions12
Multiply Fractions

If the numerators and denominators have a common factor you can simplify before multiplying.

Example

25

3 x 6 =

25

3 x2 x 3 =

Are there any factors that appear in the numerator and denominator?

multiply fractions13
Multiply Fractions

If the numerators and denominators have a common factor you can simplify before multiplying.

Example

25

3 x 6 =

25

3 x2 x 3 =

2 the common to both

multiply fractions14
Multiply Fractions

If the numerators and denominators have a common factor you can simplify before multiplying.

Example

25

3 x 6 =

25 5

3 x2 x 3 = 9

We can cancel the both 2’s.

multiply fractions15
Multiply Fractions

Multiply.

4

9x 18=

Do this on your own.

multiply fractions16
Multiply Fractions

Multiply.

4

9x 18=

41842 x 98

9 x 1 = 9x 1 = 1 = 8

multiply fractions17
Multiply Fractions

Multiply.

3

5 x 10=

Do this on your own.

multiply fractions18
Multiply Fractions

Multiply.

3

5 x 10=

3103 x 2 x 56

5x 1 = 5 x 1 = 1 = 6

multiply fractions19
Multiply Fractions

Frank had ½ of the lawn left to mow. On Saturday he mowed 2/3 of what was left. What fraction of the lawn did he mow on Saturday?

Do this on your own.

multiply fractions20
Multiply Fractions

Frank had ½ of the lawn left to mow. On Saturday he mowed 2/3 of what was left. What fraction of the lawn did he mow on Saturday?

122 1

2x 3= 6 = 3

multiply fractions21
Multiply Fractions

A paint store has 35 gallons of paint in storage, 2/5 of which are for outdoor use. The others are for indoor use. If each gallon costs $22, what is the total cost of the indoor paint in storage?

Do this on your own.

multiply fractions22
Multiply Fractions

A paint store has 35 gallons of paint in storage, 2/5 of which are for outdoor use. The others are for indoor use. If each gallon costs $22, what is the total cost of the indoor paint in storage?

There is a couple of different ways to solve this problem.

If 2/5 is outdoor paint, what fraction is indoor paint?

multiply fractions23
Multiply Fractions

A paint store has 35 gallons of paint in storage, 2/5 of which are for outdoor use. The others are for indoor use. If each gallon costs $22, what is the total cost of the indoor paint in storage?

If 2/5 is outdoor paint, what fraction is indoor paint?3/5

What is 3/5 of 35 gallons?

multiply fractions24
Multiply Fractions

A paint store has 35 gallons of paint in storage, 2/5 of which are for outdoor use. The others are for indoor use. If each gallon costs $22, what is the total cost of the indoor paint in storage?

If 2/5 is outdoor paint, what fraction is indoor paint? 3/5

What is 3/5 of 35 gallons?

335105

5 x 1 = 5 =21

What is the cost of 21 gallons?

multiply fractions25
Multiply Fractions

A paint store has 35 gallons of paint in storage, 2/5 of which are for outdoor use. The others are for indoor use. If each gallon costs $22, what is the total cost of the indoor paint in storage?

What is the cost of 21 gallons?

21 x $22 = $462

multiply fractions26
Multiply Fractions

If two positive fractions are less than one, why is the product also less than one?

multiply fractions27
Multiply Fractions

Agenda Notes

Homework –

Homework Practice 4-3

Show all Work

Due Thursday, Oct 24

Mid Chapter 4 Quiz –Monday, Oct 28

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