Multiplying Fractions by Fractions | Mathematics

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Multiplying Fractions by Fractions

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5th grade

Mathematics

19 minutes ago by

Deborah LaCrosse

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Slide 1
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Multiplying Fractions by Fractions
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Slide 2
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Multiplying Fractions with a Model
The overlapping area is the answer. So in this problem,
$\frac{1}{3}\times\frac{3}{5}=\frac{3}{15}\ or\ \frac{1}{5}$
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Question 3
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Which problem does the model represent?
answer choices
$\frac{1}{5}\times\frac{2}{6}$
$\frac{1}{3}\times\frac{2}{5}$
$\frac{2}{5}\times\frac{1}{5}$
$\frac{2}{5}\times\frac{2}{5}$
 <math><semantics><mrow><mfrac><mn>1</mn><mn>5</mn></mfrac><mo>×</mo><mfrac><mn>2</mn><mn>6</mn></mfrac></mrow><annotation encoding="application/x-tex">\frac{1}{5}\times\frac{2}{6}</annotation></semantics></math>51×62 
alternatives
 <math><semantics><mrow><mfrac><mn>1</mn><mn>3</mn></mfrac><mo>×</mo><mfrac><mn>2</mn><mn>5</mn></mfrac></mrow><annotation encoding="application/x-tex">\frac{1}{3}\times\frac{2}{5}</annotation></semantics></math>31×52 
 <math><semantics><mrow><mfrac><mn>2</mn><mn>5</mn></mfrac><mo>×</mo><mfrac><mn>1</mn><mn>5</mn></mfrac></mrow><annotation encoding="application/x-tex">\frac{2}{5}\times\frac{1}{5}</annotation></semantics></math>52×51 
 <math><semantics><mrow><mfrac><mn>2</mn><mn>5</mn></mfrac><mo>×</mo><mfrac><mn>2</mn><mn>5</mn></mfrac></mrow><annotation encoding="application/x-tex">\frac{2}{5}\times\frac{2}{5}</annotation></semantics></math>52×52 
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Question 4
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Which model correctly shows the problem $\frac{2}{6}\times\frac{1}{5}$ ?
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Question 5
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Q. George has 1/3 pan of brownies. He eats 1/4 of them. What fraction did George eat?
answer choices
1/7
1/4
1/3
1/12
1/7
alternatives
1/4
1/3
1/12
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Question 6
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Which product is represented by the model?
answer choices
2/3 of 3/4
6/12 of 2/3
1/2 of 3/4
1/12 of 2/3
2/3 of 3/4
alternatives
6/12 of 2/3
1/2 of 3/4
1/12 of 2/3
answer explanation
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Math 6.5.a
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Question 7
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What problem is represented by the model?
answer choices
1/2 x 3/10
3/5 x 9/50
3/5 x 3/10
2/5 x 3/5
1/2 x 3/10
alternatives
3/5 x 9/50
3/5 x 3/10
2/5 x 3/5
answer explanation
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Math 6.5.a
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Question 8
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Q.
Use the model to find the product.
answer choices
35/1
2/12
1/6
1/35
35/1
alternatives
2/12
1/6
1/35
answer explanation
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Math 6.5.a
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Question 9
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Which fraction model shows 2/5 x 2/3?
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Slide 10
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Multiplying Fractions by Fractions Without Models
Multiply the numerators.
Multiply the denominators.
Simplify if needed.
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Question 11
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Q. George has 1/3 pan of brownies. He eats 1/4 of them. What fraction did George eat?
answer choices
1/7
1/4
1/3
1/12
1/7
alternatives
1/4
1/3
1/12
answer explanation
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Question 12
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Q.
Mimi is baking cookies for her grandson. The recipe calls for ⅔ cup of chocolate chips and she wants to make half of a batch. Which of the following statements is true?
answer choices
She will use ⅔ cup of chocolate chips.
She will use more than ⅔ cup of chocolate chips.
She will use less than ⅔ cup of chocolate chips.
She will double the amount of chocolate chips.
She will use ⅔ cup of chocolate chips.
alternatives
She will use more than ⅔ cup of chocolate chips.
She will use less than ⅔ cup of chocolate chips.
She will double the amount of chocolate chips.
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Question 13
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Q.
Multiply these fractions: remember to simplify!
answer choices
1/5
10/18
6/30
0
1/5
alternatives
10/18
6/30
0
answer explanation
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Question 14
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Find the product:
answer choices
6/28
9/28
6/11
12/21
6/28
alternatives
9/28
6/11
12/21
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Question 15
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Q. There are 28 students in a math class. ⁴⁄₇ of the students were boys. How many boys were in the math class?
answer choices
16 boys
12 girls
14 girls
12 boys
16 boys
alternatives
12 girls
14 girls
12 boys
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Question 16
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Q.
Bella has 32 songs on her iphone. Three-eighths of those songs are by Justin Timberlake. How many Justin Timberlake songs does Bella have on her iphone?
answer choices
12 songs
15 songs
9 songs
18 songs
12 songs
alternatives
15 songs
9 songs
18 songs
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Question 17
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Q.
answer choices

alternatives

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