Chapter 7 Multiply Fractions
Chapter 7 Multiply Fractions
7
Chapter
Activity
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Use recipes to practice multiplication with fractions and mixed numbers. Work
together to solve problems such as, “One batch of the recipe calls for 2 1_4 cups of
flour. How much flour would we need to make 1 1_2 batches?”
Chapter 7 P133
7 Carta
Capítulo
P134
Lesson 7.1
Name
Find Part of a Group COMMON CORE STANDARD—5.NF.4a
Apply and extend previous understandings
of multiplication and division to multiply and
divide fractions.
6
3. __
10 × 10 = _ 4. __23 × 9 = _
5. __16 × 18 = _ 6. __45 × 10 = _
Problem
Problem Solving
Solving
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7. Marco drew 20 pictures. He drew 3_4 of them in 8. Caroline has 10 marbles. One half of them
art class. How many pictures did Marco draw in are blue. How many of Caroline’s marbles
art class? are blue?
Chapter 7 P135
Lesson Check (5.NF.4a)
1. Use the model to find 1_3 × 15. 2. Use the model to find 2_4 × 16.
6,560
5. Rafi had a board that was 15 1_2 feet long. 6. Susie spent 4 1_4 hours on Monday and 3 5_8 hours
He cut three pieces off the board that are each on Tuesday working on a history project. About © Houghton Mifflin Harcourt Publishing Company
3 7_8 feet long. How much of the board is left? how long did she spend working on the project?
P136
Lesson 7.2
Name
Multiply Fractions and Whole Numbers COMMON CORE STANDARD—5.NF.4a
Apply and extend previous understandings
of multiplication and division to multiply
and divide fractions.
Use the model to find the product.
5
_ 1
12 × 3 =
1. __
5 , or 1_ 2. 3 × __34 =
4
___ 4 ___
1 1 1
1 1 1 1 1 1 1 1 1 1 1 1
4 4 4 4 4 4 4 4 4 4 4 4
6. 7 × __56 = 7. __
5
12 × 6 = 8. 9 × __23 = ___
___ ___
Problem
Problem Solving
Solving
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9. Jody has a 5-pound bag of potatoes. She uses 4_5 of 10. Lucas lives 5_8 mile from school. Kenny lives twice
the bag to make potato salad. How many pounds as far as Lucas from school. How many miles
of potatoes does Jody use for the potato salad? does Kenny live from school?
Chapter 7 P137
Lesson Check (5.NF.4a)
1. In gym class, Ted runs 4_5 mile. His teacher runs 2. Jon is decorating a banner for a parade. Jon uses
6 times that distance each day. How many miles a piece of red ribbon, which is 3_4 yard long. Jon
does Ted’s teacher run each day? also needs blue ribbon that is 5 times as long as
the red ribbon. How much blue ribbon does
Jon need?
5. What is the value of the expression? 6. Which of the following decimals has the least
value? 0.3; 0.029; 0.003; 0.01
30 − 5 × 4 + 2 © Houghton Mifflin Harcourt Publishing Company
P138
Lesson 7.3
Name
Fraction and Whole Number Multiplication COMMON CORE STANDARD—5.NF.4a
Apply and extend previous understandings
of multiplication and division to multiply
and divide fractions.
Find the product. Write the product in simplest form.
1
2_
1. 4 × __58 = ____ 2 2. __29 × 3 = ____ 3. __45 × 10 = ____
4×_
5
= __
20
8 8
__
20
= 2_
4
, or 2 1_2
8 8
3
7. __25 × 6 = ____ 8. 9 × __23 = ____ 9. __
10 × 9 = ____
Problem
Problem Solving
Solving
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13. Leah makes aprons to sell at a craft fair. She 14. The gas tank of Mr. Tanaka’s car holds
needs 3_4 yard of material to make each apron. 15 gallons of gas. He used 2_3 of a tank of
How much material does Leah need to make gas last week. How many gallons of gas
6 aprons? did Mr. Tanaka use?
Chapter 7 P139
Lesson Check (5.NF.4a)
1. At the movies, Liz eats 1_4 of a box of popcorn. 2. It takes Ed 45 minutes to complete his science
Her friend Kyra eats two times as much popcorn homework. It takes him 2_3 as long to complete
as Liz eats. How much of a box of popcorn does his math homework. How long does it take Ed to
Kyra eat? complete his math homework?
5. Eric jogged 3 1_4 miles on Monday, 5 5_8 miles on 6. Sharon bought 25 pounds of ground beef and
Tuesday, and 8 miles on Wednesday. Suppose made 100 hamburger patties of equal weight.
he continues the pattern for the remainder of What is the weight of each hamburger patty?
the week. How far will Eric jog on Friday? © Houghton Mifflin Harcourt Publishing Company
P140
Lesson 7.4
Name
Multiply Fractions COMMON CORE STANDARD—5.NF.4b
Apply and extend previous understandings of
multiplication and division to multiply and
divide fractions.
Find the product.
1. 2.
2 , or _
__ 1
1 2 2 5
__ __
12
4 × 3 = __ 6 __ __
5 × 6 = __
Problem
Problem Solving
Solving
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7. Nora has a piece of ribbon that is 3_4 yard long. She 8. Marlon bought 7_8 pound of turkey at the deli.
will use 1_2 of it to make a bow. What length of the He used 2_3 of it to make sandwiches for lunch.
ribbon will she use for the bow? How much of the turkey did Marlon use
for sandwiches?
Chapter 7 P141
Lesson Check (5.NF.4b)
1. Tina has 3_5 pound of rice. She will use 2_3 of it to 2. The Waterfall Trail is 3_4 mile long. At 1_6 of
make fried rice for her family. How much rice the distance from the trailhead, there is a
will Tina use to make fried rice? lookout. In miles, how far is the lookout
from the trailhead?
5. Erin is going to sew a jacket and a skirt. She 6. Simplify the following expression.
needs 2 3_4 yards of material for the jacket and
1 1_2 yards of material for the skirt. Altogether, [(3 × 6) + (5 × 2)] ÷ 7
how many yards of material does Erin need?
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P142
Lesson 7.5
Name
Compare Fraction Factors and Products COMMON CORE STANDARDS—5.NF.5a,
5.NF.5b Apply and extend previous
understandings of multiplication and division
to multiply and divide fractions.
Complete the statement with equal to, greater than, or less than.
less than
1. 3_5 × 4_7 will be ____ 4_7 . 2. 5 × 7_8 will be ____ 7_8 .
5. 7_8 × 3_5 will be ____ 3_5 . 6. 4_5 × 7_7 will be ____ 4_5 .
Problem
Problem Solving
Solving
7. Starla is making hot cocoa. She plans to multiply 8. Miles is planning to spend 2_3 as many hours
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the recipe by 4 to make enough hot cocoa for bicycling this week as he did last week. Is Miles
the whole class. If the recipe calls for 1_2 teaspoon going to spend more hours or fewer hours
vanilla extract, will she need more than 1_2 bicycling this week than last week?
teaspoon or less than 1_2 teaspoon of vanilla
extract to make all the hot cocoa?
Chapter 7 P143
Lesson Check (5.NF.5a, 5.NF.5b)
1. Trevor saves 2_3 of the money he earns at his 2. Suppose you multiply a whole number greater
after-school job. Suppose Trevor starts saving 1_4 than 1 by the fraction 3_5 . Will the product be
as much as he is saving now. Will he be saving greater than, less than, or equal to 3_5 ?
less, more, or the same amount?
5. Megan hiked 15.12 miles in 6.3 hours. If Megan 6. It is 42 1_2 miles from Eaton to Baxter, and
hiked the same number of miles each hour, how 37 4_5 miles from Baxter to Wellington. How far
many miles did she hike each hour? is it from Eaton to Wellington, if you go by way
of Baxter?
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P144
Lesson 7.6
Name
Fraction Multiplication COMMON CORE STANDARD—5NF.4a
Apply and extend previous understandings
of multiplication and division to multiply
and divide fractions.
Find the product. Write the product in simplest form.
7 4
1. 4_ × _8 =
×7
___ 2. 3 × 1_6 3. _59 × 3_4 4. _47 × 1_ 5. _18 × 20
5 5 ×8 2
= __
28
40
= _7 __ __ __ __
10
6. _45 × 3_ 7. _67 × 7_ 8. 8 × 1_ 1 × 28
9. __
14
10. 3_4 × 1_3
8 9 9
__ __ __ __ __
11. Karen raked 3_5 of the yard. Minni raked 1_3 of the 12. In the pet show, 3_8 of the pets are dogs. Of the
amount Karen raked. How much of the yard did dogs, 2_3 have long hair. What fraction of the pets
Minni rake? are dogs with long hair?
__ __ __ __
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Problem
Problem Solving
Solving
17. Jason ran 5_7 of the distance around the school 18. A group of students attend a math club. Half
track. Sara ran 4_5 of Jason’s distance. What of the students are boys and 4_9 of the boys have
fraction of the total distance around the track brown eyes. What fraction of the group are boys
did Sara run? with brown eyes?
Chapter 7 P145
Lesson Check (5.NF.4a)
1. Fritz attended band practice for 5_6 hour. Then 2. Darlene read 5_8 of a 56-page book. How many
he went home and practiced for 2_5 as long as pages did Darlene read?
band practice. How many minutes did he
practice at home?
5. Keith had 81_ cups of flour. He used 52_ cups to 6. The Blue Lake Trail is 11 3_8 miles long. Gemma
2 3
make bread. How many cups of flour does Keith has hiked 2 1_2 miles each hour for 3 hours. How
have left? far is she from the end of the trail?
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P146
Lesson 7.7
Name
Area and Mixed Numbers COMMON CORE STANDARD—5.NF.4b
Apply and extend previous understandings
of multiplication and division to multiply
and divide fractions.
Use the grid to find the area.
1. Let each square represent 1_4 unit by 1_4 unit. 2. Let each square represent 1_3 unit by 1_3 unit.
3 3_
2__14 × 1__12 = _8 1__23 × 2__13 = _
Problem
Problem Solving
Solving
6. Ava’s bedroom rug is 2 3_4 feet long and 2 1_2 feet 7. A painting is 2 2_3 feet long and 1 1_2 feet high. What is
wide. What is the area of the rug? the area of the painting?
Chapter 7 P147
Lesson Check (5.NF.4b)
1. The base of a fountain is rectangular. Its 2. Bill’s living room floor is covered with carpet
dimensions are 1 2_3 feet by 2 2_3 feet. What is the tiles. Each tile is 1 1_2 feet long by 2 3_5 feet wide.
area of the base of the fountain? What is the area of one tile?
5. What is the best estimate for the quotient 6. There are 45 vehicles in a parking lot. Three
5,397 ÷ 62? fifths of the vehicles are minivans. How many of
the vehicles in the parking lot are minivans?
P148
Lesson 7.8
Name
Compare Mixed Number Factors and Products COMMON CORE STANDARDS—5.NF.5a,
5.NF.5b Apply and extend previous
understandings of multiplication and division to
multiply and divide fractions.
Complete the statement with equal to, greater than, or less than.
less than
1. 2_3 × 1 5_8 will be ____ 1 5_8 . 2. 5_5 × 2 3_4 will be ____ 2 3_4 .
5. 1 7_8 × 2 3_8 will be ____ 2 3_8 . 6. 3 4_9 × 5_9 will be ____ 3 4_9 .
Problem
Problem Solving
Solving
7. Fraser is making a scale drawing of a dog house. 8. Jorge has a recipe that calls for 2 1_3 cups of flour.
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The dimensions of the drawing will be 1_8 of the He plans to make 1 1_2 times the recipe. Will the
dimensions of the actual doghouse. The height amount of flour Jorge needs be equal to, greater
of the actual doghouse is 36 3_4 inches. Will the than, or less than the amount of flour his recipe
dimensions of Fraser’s drawing be equal to, calls for?
greater than, or less than the dimensions of the
actual dog house?
Chapter 7 P149
Lesson Check (5.NF.5a, 5.NF.5b)
1. Jenna skis 2 1_3 miles down the mountain. Her 2. Suppose you multiply a fraction less than 1 by
instructor skis 1 1_2 times as far. Does Jenna ski the mixed number 2 3_4 . Will the product be less
a shorter, greater, or the same distance as her than, greater than, or equal to 2 3_4 ?
instructor?
5. One bread recipe calls for 2 1_3 cups of flour. 6. On Monday, it rained 1 1_4 inches. On Tuesday,
Another bread recipe calls for 2 1_2 cups of flour. it rained 3_5 inch. How much more did it rain on
Tim has 5 cups of flour. If he makes both Monday than on Tuesday?
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P150
Lesson 7.9
Name
Multiply Mixed Numbers COMMON CORE STANDARD—5.NF.6
Apply and extend previous understandings
of multiplication and division to multiply
and divide fractions.
Find the product. Write the product in simplest form.
3
1. 12_ × 42_ 2. 11_7 × 13_4 3. 81_ × _5 4. 25_ × 12_
3 5 3 8 3
_ _ _ _
12 3 42 5 5 3 22
3 5 3 5
5 __ _
110
5 22
15 3
57 _ 1
3
__ __ __
__ __ __ __
__ __ __
Problem
Problem Solving
Solving
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12. Jake can carry 6 1_4 pounds of wood in from the 13. A glass can hold 331_ cups of water. A bowl can
barn. His father can carry 1 5_7 times as much as hold 2 3_5 times the amount in the glass. How many
Jake. How many pounds can Jake’s father carry? cups can a bowl hold?
_______ _______
Chapter 7 P151
Lesson Check (5.NF.6)
1. A vet weighs two puppies. The small puppy 2. Becky lives 5 5_8 miles from school. Steve lives
weighs 4 1_2 pounds. The large puppy weighs 1 5_9 times as far from school as Becky. How far
4 2_3 times as much as the small puppy. How does Steve live from school?
much does the large puppy weigh?
5. What is the least common denominator of the 6. Three girls collected geodes in the desert.
four fractions listed below? Corinne collected 11 1_8 pounds, Ellen collected
7 4 5_8 pounds, and Leonda collected 3 3_4 pounds.
20__ 203_4 9
18__ 2018
__
10 10 25 How much more did Corinne collect than the
other two girls combined?
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P152
PROBLEM SOLVING
Name
Lesson 7.10
Problem Solving • Find Unknown Lengths
COMMON CORE STANDARD—5.NF.5b
Apply and extend previous understandings of
multiplication and division to multiply and
divide fractions.
1. Kamal’s bedroom has an area of 120 square feet. The Guess: 6 × 20 = 120
width of the room is __56 the length of the room. What are Check: 5_6 × 20 = 16 2_3 ; try a longer width.
the dimensions of Kamal’s bedroom?
Guess: 10 × 12 = 120
Check: 5_6 × 12 = 10. Correct!
10 feet by 12 feet
________
________
________
________
Chapter 7 P153
Lesson Check (5.NF.5b)
1. Consuelo’s living room is in the shape of a 2. A rectangular park has an area of 2_3 square mile.
rectangle and has an area of 360 square feet. The length of the park is 2 2_3 the width of the
The width of the living room is 5_8 its length. park. What is the width of the park?
What is the length of the living room?
5. Leah bought 4 1_2 pounds of grapes. Of the grapes 6. To which place value is the following number
she bought, 1 7_8 pounds were red grapes. The rest rounded?
were green grapes. How many pounds of green
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5.927 to 5.93
grapes did Leah buy?
P154