Using Tape Diagrams to Solve Ratio Problems · 2017. 11. 21. · There ratio of small dogs to large...
Transcript of Using Tape Diagrams to Solve Ratio Problems · 2017. 11. 21. · There ratio of small dogs to large...
![Page 1: Using Tape Diagrams to Solve Ratio Problems · 2017. 11. 21. · There ratio of small dogs to large dogs at the dog show is 4:3. If there are 56 dogs ... 7 x 6 = 42 42 total bags](https://reader035.fdocuments.us/reader035/viewer/2022062610/611231a1b5e0df1b48721c37/html5/thumbnails/1.jpg)
Using Tape Diagrams
to Solve Ratio Problems
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Learning Goal:
I can solve real-world ratio problems using a
tape diagram.
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The ratio of boys to girls in the sixth grade is 3:5. If there are 20 more girls
than boys, how many total students are in the
sixth grade?
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The ratio of boys to girls in the sixth grade is 3:5. If there are 20 more girls than boys, how many
total students are in the sixth grade?
The ratio we’re working with is 3:5. Draw a tape diagram that represents that ratio.
Boys
Girls
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The ratio of boys to girls in the sixth grade is 3:5. If there are 20 more girls than boys, how many
total students are in the sixth grade?
What part of our tape diagram represents 20 more girls?
Boys
Girls
20 MORE
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The ratio of boys to girls in the sixth grade is 3:5. If there are 20 more girls than boys, how many
total students are in the sixth grade?
“20 more girls” is represented by 2 boxes on our tape diagram. What value should be written in each box?
Boys
Girls
20 MORE
10 10
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The ratio of boys to girls in the sixth grade is 3:5. If there are 20 more girls than boys, how many
total students are in the sixth grade?
Now we can find out how many total students are in sixth grade. REMEMBER, each box represents the same value. What value should be written in each box?
Boys
Girls 10 10
10 10 10
10 10 10
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The ratio of boys to girls in the sixth grade is 3:5. If there are 20 more girls than boys, how many
total students are in the sixth grade?
Add up all the boxes to determine the total number of students.
1
Boys
Girls 10 10
10 10 10
10 10 10
8 boxes of 10 =
80 students
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There ratio of small dogs to large dogs at the dog show is 4:3. If there are
60 dogs in the show, how many are large
dogs?
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There ratio of small dogs to large dogs at the dog show is 4:3. If there are 60 dogs in the show, how
many are large dogs?
The ratio we’re working with is 4:3. Draw a tape diagram that represents that ratio.
Small Dogs
Large Dogs
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There ratio of small dogs to large dogs at the dog show is 4:3. If there are 56 dogs in the show, how
many are large dogs?
What part of the tape diagram represents all 60 dogs in the show?
Small Dogs
Large Dogs
All the tape diagram represents the 60 dogs in the show
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There ratio of small dogs to large dogs at the dog show is 4:3. If there are 56 dogs in the show, how
many are large dogs?
There are 7 boxes on the tape diagram. REMEMBER, each box represents the same value.
56 total dogs ÷ 7 boxes = 8
Each box on the tape diagram represents 8 dogs.
Small Dogs
Large Dogs
All the tape diagram represents the 56 dogs in the show
8 8 8 8
8 8 8
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There ratio of small dogs to large dogs at the dog show is 4:3. If there are 56 dogs in the show, how
many are large dogs?
Now we can find out how many dogs are large dogs.
3 x 8 = 24
Small Dogs
Large Dogs
8 8 8 8
8 8 8
There are 24 large dogs in the dog show.
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The ratio of red pens to blue pens in a package is 2:5. If there are 35 blue
pens in the package, how many red pens are
in the package?
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The ratio of red pens to blue pens in a package is 2:5. If there are 35 blue pens in the package,
how many red pens are in the package?
The ratio we’re working with is 2:5. Draw a tape diagram that represents that ratio.
Red
Blue
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The ratio of red pens to blue pens in a package is 2:5. If there are 35 blue pens in the package,
how many red pens are in the package?
What part of our tape diagram represents the 35 blue pens?
Red
Blue
35 blue pens
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The ratio of red pens to blue pens in a package is 2:5. If there are 35 blue pens in the package,
how many red pens are in the package?
Red
Blue
35 blue pens
35 blue pens is represented by 5 boxes on our tape diagram. What value should be written in each box?
35 ÷ 5 = 7
7 7 7 7 7
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The ratio of red pens to blue pens in a package is 2:5. If there are 35 blue pens in the package,
how many red pens are in the package?
Red
Blue 7 7 7 7 7
Now we can find out how many red pens are in the package. REMEMBER, each box represents the same value. What value should be written in each box?
7 7 2 x 7 = 14
There are 14 red pens in the package.
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Let’s try some more problems!
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The ratio of red pens to blue pens in a package is 2:5. If there are 35 blue
pens in the package, how many red pens are
in the package?
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Step #1 Look for the ratio in the problem and make a tape diagram.
2:5
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Step #2 Look in the problem for information that will help you determine the value of each box.
35 blue pens in the package
Red
Blue
35 blue pens
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Step #3 Determine the value of each box. Remember all boxes have an equal value.
35 ÷ 5 = 7
Red
Blue
35 blue pens
7 7 7 7 7
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Step #4 Use the value of the boxes to answer the question in the problem.
How many red pens are in the package?
Red
Blue 7 7 7 7 7
2 x 7 = 14
14 red pens
7 7
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The ratio of red roses to pink roses in a bouquet is 4:1. If there are 12 red roses, how many pink roses are in the
bouquet?
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Step #1 Look for the ratio in the problem and make a tape diagram.
4:1
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Step #2 Look in the problem for information that will help you determine the value of each box.
12 red roses
Red
Pink
12 red roses
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Step #3 Determine the value of each box. Remember all boxes have an equal value.
12 red roses
Red
Pink
12 red roses
12 ÷ 4 = 3
3 3 3 3
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Step #4 Use the value of the boxes to answer the question in the problem.
How many pink roses are in the bouquet?
Red
Pink
12 red roses
3 3 3 3
3
There are 3 pink roses in the bouquet.
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Mr. Jakers bought some apples to make applesauce. He bought red apples and
green apples in a ratio of 7:9. If he bought 8 more green
apples, than red apples, how many total apples did he
buy?
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Step #1 Look for the ratio in the problem and make a tape diagram.
7:9
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Step #2 Look in the problem for information that will help you determine the value of each box.
He bought 8 more green apples
Red
Green
8 more
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Step #3 Determine the value of each box. Remember all boxes have an equal value.
He bought 8 more green apples
Red
Green
8 more
8 ÷ 2 = 4
4 4
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Step #4 Use the value of the boxes to answer the question in the problem.
How many total apples did he buy?
Red
Green
4 x 16 = 64
4 4 4 4 4 4 4 4
4 4 4 4 4 4 4
4
He bought 64 apples.
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To make Purple Plum paint, the paint store mixes blue
and red paint in a ratio of 8:5. If a customer needs 65
gallons of paint, how many gallons of each color needs to
go into the mix?
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Step #1 Look for the ratio in the problem and make a tape diagram.
8:5
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Step #2 Look in the problem for information that will help you determine the value of each box.
Customer needs 65 gallons of paint
Blue
Red
All the boxes together represent the value of 65
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Step #3 Determine the value of each box. Remember all boxes have an equal value.
Customer needs 65 gallons of paint
Blue
Red
All the boxes together represent the value of 65
65 gallons ÷ 13 boxes = 5
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Step #4 Use the value of the boxes to answer the question in the problem.
How many gallons of each color needs to go into the mix?
Blue
Red
40 gallons of blue paint and 25 gallons of red paint
8 x 5 = 40
5 x 5 = 25
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Now try some problems on your
own!
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I bought bags of chocolate and bags of nuts in a ratio of 3:4. If I bought 6 more nuts
than oranges, how many total bags did I buy?
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Chocolate
Nuts
6 more
6
6 6 6
6 6 6
7 x 6 = 42
42 total bags
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The ratio of the number of cars to SUVs in a parking lot is 4:1. If there are 30 total cars in the parking lot, how many
SUVs are there?
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cars
SUVs
30 total cars
30 cars ÷ 5 boxes = 6
6
There are 6 SUVs in the parking lot.
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Dylan and Sam share a group of baseball cards in a ratio of 8:3. If Sam has 15 baseball
cards, how many does Dylan have?
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Dylan
Sam
15 cards
15 ÷ 3 = 5
5 5 5
8 x 5 = 40
Dylan has 40 baseball cards.
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How about a challenge?
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Courtney, Carson, and Cassie share a sum of money in the ratio 6:4:3. Carson used ½ of his money to buy a remote-controlled car that cost $60, and Courtney gave 1/3 of her money to charity. How much
money do they have left altogether?
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Courtney
Carson
Cassie
$60
Carson spent ½ of his money
60 ÷ 2 = 30
Each box represents 30
Mark off the boxes of spent money.
Courtney gave 1/3 of her money to charity
There are 9 boxes left.
9 x 30 = 270 They have $270 left.
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Great Work!