Warm Up

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Preview
Warm Up
California Standards
Lesson Presentation
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Warm Up Write each number as an improper
fraction.
1
2
7
1.
3.
2
2.
3
1
3
5
8
2
3
4.
6
5.
5
3
8
3
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Additional Example 1A Multiplying Fractions
Multiply. Write the answer in simplest form.
6 7
1 8
Multiply numerators.
Multiply denominators.
Look for common factors 2.
Simplify.
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Additional Example 1B Multiplying Fractions
Multiply. Write the answer in simplest form.
2 3
1 2

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Multiply numerators.
Multiply denominators.
Look for common factors 2, 3.
Simplify.
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Check It Out! Example 1A
Multiply. Write the answer in simplest form.
5 8
3 5
Multiply numerators.
Multiply denominators.
Look for common factors 5.
Simplify.
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Check It Out! Example 1B
Multiply. Write the answer in simplest form.
4 7
7 8

Multiply numerators.
Multiply denominators.
Look for common factors 4, 7.
Simplify.
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To multiply a fraction by an integer, first write
the integer as a fraction with a denominator of
1. Then multiply as you would with two fractions.
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Additional Example 2 Application
1 20
(7)
Write the integer 7 as a fraction.
Multiply numerators and denominators.


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Check It Out! Example 2
1 7
Mark runs mile each day. What is the total
distance Mark runs in 5 days?
(5)
Write the integer 5 as a fraction.
Multiply numerators and denominators.


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To multiply decimals, first multiply as you would
with integers. The number of decimal places in
the product is equal to the sum of the number of
decimal places in the factors.
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Additional Example 3 Multiplying Decimals
Multiply.
A. 2(0.51)
0 decimal places
2
? 0.51
2 decimal places
1.02
0 2 2 decimal places.
B. (0.4)(3.75)
3.75
2 decimal places
? -0.4
1 decimal place
1.500
2 1 3 decimal places
or 1.5
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Check It Out! Example 3
Multiply.
A. 3.1(0.28)
1 decimal place
3.1
? 0.28
2 decimal places
0.868
1 2 3 decimal places
B. (0.4)(2.53)
0.4
1 decimal place
? 2.53
2 decimal places
1 2 3 decimal places
1.012
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Lesson Quiz
Multiply.
1 7
1.
9
5 8
2 3
2.

1.034
3. 0.47(2.2)
1 2
4. Evaluate 2 (x) for x .
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Edgar runs mile each day. What is the total
distance that Edgar runs in a 7-day week?
5.