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
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5 Minute Check Complete in your notebook. 1 1. 3 x 12
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5 Minute Check Complete in your notebook. 1 1. 3 x 12 1 12 12 3
x 1 = 3 = 4
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5 Minute Check Complete in your notebook. 3 2. 7 x 8
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5 Minute Check Complete in your notebook. 3 2. 7 x 8 3 8 24 3 7
x 1 = 7 = 3 7
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5 Minute Check Complete in your notebook. 5 3. 6 x 15
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5 Minute Check Complete in your notebook. 5 3. 6 x 15 5 15 60 6
x 1 = 6 = 10
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5 Minute Check Complete in your notebook. 2 4. 5 x 11
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5 Minute Check Complete in your notebook. 2 4. 5 x 11 2 11 22 2
5 x 1 = 5 = 4 5
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Flashcards!
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Wednesday, Oct 23 Lesson 4.3 Multiply Fractions
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Objective: To understand how to multiply fractions.
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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?
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Multiply Fractions To multiply fractions, multiply the
numerators and multiply the denominators, then simplify if needed.
Example x = 3 2 6 3 4 x 5 = 20 = 10 x =
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Multiply Fractions Multiply. 1 3 2 x 5 = Estimate? Reminder
When estimating the product of two fractions, round each fraction
to 0, or 1 and then multiply.
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Multiply Fractions Multiply. 1 3 2 x 5 = 1 1 1 2 x 2 = 4 Actual
Product?
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Multiply Fractions Multiply. 1 3 2 x 5 = Actual Product? 1 3 3
2 x 5 = 10 Is this a reasonable answer?
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Multiply Fractions and Whole Numbers Multiply. 1 3 2 x 5 =
Actual Product? 1 3 3 2 x 5 = 10 3 1 Is this a reasonable answer?
10 4
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Multiply Fractions Multiply. 2 5 3 x 6 = Do this on your
own.
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Multiply Fractions Multiply. 2 5 3 x 6 = Estimate?
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MuMultiply Fractions Multiply. 2 5 3 x 6 = 1 2 x 1 = 2 Actual
Product?
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Multiply Fractions Multiply. 2 5 3 x 6 = Actual Product? 2 5 10
5 3 x 6 = 18 = 9 Is this a reasonable answer?
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Multiply Fractions Multiply. 2 5 3 x 6 = Actual Product? 2 5 10
5 3 x 6 = 18 = 9 5 1 Is this a reasonable answer? 9 2
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Multiply Fractions If the numerators and denominators have a
common factor you can simplify before multiplying.
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Multiply Fractions If the numerators and denominators have a
common factor you can simplify before multiplying. Example 2 5 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?
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Multiply Fractions If the numerators and denominators have a
common factor you can simplify before multiplying. Example 2 5 3 x
6 = 2 5 3 x 2 x 3 = Are there any factors that appear in the
numerator and denominator?
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Multiply Fractions If the numerators and denominators have a
common factor you can simplify before multiplying. Example 2 5 3 x
6 = 2 5 3 x 2 x 3 = 2 the common to both
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Multiply Fractions If the numerators and denominators have a
common factor you can simplify before multiplying. Example 2 5 3 x
6 = 2 5 5 3 x 2 x 3 = 9 We can cancel the both 2s.
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Multiply Fractions Multiply. 4 9 x 18 = Do this on your
own.
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Multiply Fractions Multiply. 4 9 x 18 = 4 18 4 2 x 9 8 9 x 1 =
9 x 1 = 1 = 8
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Multiply Fractions Multiply. 3 5 x 10 = Do this on your
own.
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Multiply Fractions Multiply. 3 5 x 10 = 3 10 3 x 2 x 5 6 5 x 1
= 5 x 1 = 1 = 6
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Multiply Fractions Frank had 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.
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Multiply Fractions Frank had 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? 1 2 2 1 2 x 3 = 6 = 3
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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.
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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?
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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?
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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? 3 35 105 5 x 1 = 5 =
21 What is the cost of 21 gallons?
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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
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Multiply Fractions If two positive fractions are less than one,
why is the product also less than one?
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Multiply Fractions Agenda Notes Homework Homework Practice 4-3
Show all Work Due Thursday, Oct 24 Mid Chapter 4 Quiz Monday, Oct
28