lesson 9 multiply and divide fractions
TRANSCRIPT
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8/13/2019 Lesson 9 Multiply and Divide Fractions
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Mr. C Chapter 1: Lesson 9: Multiply and Divide Fractions 1
Lesson 9: Multiply and Divide Fractions
ObjectiveIn this lesson, students will learn to multiply and divide fractions.
Multiply Fractions
Steps1. Multiply the numerators2. Multiply the denominators3. Find the factors of the numerator and denominator4. Cancel common terms5. Solution
Example 1Multiply the fraction and write the solution in simplest form.
Fraction Multiply Numerators Multiply Denominators
4
3*
6
5
5 * 3
15
6 * 4
24
Factor Numerator Factor DenominatorThe factor of 15 are
3*5
The factor of 24 are
2*2*2*3
Cancel Common Factors
8
5
4
3*
6
5
Solution
8
5
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Mr. C Chapter 1: Lesson 9: Multiply and Divide Fractions 2
Lesson 9: Multiply and Divide Fractions
Practice 1Multiply each fraction and write the solution in lowes terms.
1.3
2*
8
4
2.5
4*
30
15
3.2
1*
40
25
4.6
1*
12
3
5.9
27*
27
9
6.7
5*
50
50
7.7
2*
16
14
8.9
7*
7
21
9.64
70*
70
64
10.13
39*
39
13
11.4
3*
6
4
12.3
5*
6
3
13.20
12*
15
10
14.18
14*
12
9
15.4
1*
5
5
16.14
28*
28
14
17.32
16*
8
32
18.2
1*
30
20
19.7
6*
16
15
20.9
5*
144
144
21.110
100*
100
110
Answers
1) __________2) __________3) __________4) __________5) __________6) __________7) __________8) __________9) __________10)__________11)__________12)__________13)__________14)__________15)__________16)__________17)__________18)__________19)__________20)__________21)__________
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8/13/2019 Lesson 9 Multiply and Divide Fractions
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Mr. C Chapter 1: Lesson 9: Multiply and Divide Fractions 3
Lesson 9: Multiply and Divide Fractions
Divide Fractions
Steps1. Invert the second fraction and change the division symbol to multiplication.2. Multiply the numerators3. Multiply the denominators4. Find the factors of the numerator and denominator5. Cancel common terms6. Solution
Example 1
Divide the fraction and write the solution in simplest form.
Fraction Invert Fraction Multiply Numerators Multiply Denominators
3
2
7
4
2
3*
7
4
Flip second fraction and
change the division
symbol to multiplication.
4 * 3
12
7 * 2
14
Factor Numerator Factor Denominator
The factor of 12 are
2*2*3
The factor of 24 are
2*7
Cancel Common Factors
7
6
2
3*
7
4
Solution
7
6
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Mr. C Chapter 1: Lesson 9: Multiply and Divide Fractions 4
Lesson 9: Multiply and Divide Fractions
Practice 1Divide each fraction and write the solution in lowes terms.
1.3
2
8
4
2.5
4
30
15
3.2
1
40
25
4.6
1
12
3
5.9
27
27
9
6.7
5
50
50
7.7
2
16
14
8.9
7
7
21
9.64
70
70
64
10.13
39
39
13
11.4
3
6
4
12.3
5
6
3
13.20
12
15
10
14.18
14
12
9
15.4
1
5
5
16.14
28
28
14
17.32
16
8
32
18.2
1
30
20
19.7
6
16
15
20.9
5
144
144
21.110
100
100
110
Answers
1) __________2) __________3) __________4) __________5) __________6) __________7) __________8) __________9) __________10)__________11)__________12)__________13)__________14)__________15)__________16)__________17)__________18)__________19)__________20)__________21)__________
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8/13/2019 Lesson 9 Multiply and Divide Fractions
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Mr. C Chapter 1: Lesson 9: Multiply and Divide Fractions 5
Lesson 9: Test Your Knowledge
Multiply or Divide each fraction.
1.5
3*
6
4
2.5
4*
30
5
3.10
5*
40
15
4.12
13
12
13
5.20
2
20
4
6.10
5
8
6
7.4
3*
9
6
8.7
3
7
2
9.70
7
70
6
10.13
39*
39
13
11.4
14
6
14
12.30
5
6
9
13.20
1
15
10
14.27
4*
10
9
15.4
3*
5
5
16.14
8*
28
4
17.32
6
8
2
18.2
1
3
2
19.9
6
16
1
20.9
6
14
4
21.22
10*
10
11
Answers
1) __________2) __________3) __________4) __________5) __________6) __________7) __________8) __________9) __________10)__________11)__________12)__________13)__________14)__________15)__________16)__________17)__________18)__________19)__________20)__________21)__________