AnswersFL-1205040-MJ Grade 7 Mathematics B -GFChanging a Scale

Changing a Scale — Unit test Answers

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Enjoli is making cupcakes for a party. She needs 45 cupcakes but the recipe makes 15. Strawberry Cupcake RecipeBatchesStrawberries1 cups2 3 4 If she does not want any leftovers, which point should Enjoli use to determine the amount of strawberries she will need to make her cupcakes?

Question illustration
A
A
B
B
C
C
D
D
2
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The scale drawing below shows an enlargement by a scale factor of 2. What is the missing side length in the original trapezoid?

Question illustration
A
4.5
B
9
C
13.5
D
18
3

Which equation represents the same proportional relationship as the graph?

Question illustration
A
y = three-fifths x
Option A
B
y = five-thirds x
Option B
C
x y = three-fifths
Option C
D
x y = five-thirds
Option D
4

The rectangle below was enlarged using a scale factor. What is the area of the original rectangle?

Question illustration
A
8 cm²
B
20 cm²
C
25 cm²
D
40 cm²
5

Each serving of a cereal is 80 calories. Which expression can be used to find the number of calories in 3 servings?

A
80 times 3
Option A
B
80 divided by 3
Option B
C
3 divided by 80
Option C
D
80 minus 3
Option D
6

Ming used the calculations shown to find out how much he would spend on 6 pounds of ground beef if 10 pounds of ground beef cost $25.00.What was Ming’s error?

Question illustration
A
He determined pounds per dollar by dividing 10 by 25 but wrote the unit rate as a dollar value.
B
He divided the numerator and the denominator of the fraction by 25.
C
He made a mistake when finding the quotient of 10 pounds and 25 dollars.
D
He made a mistake when finding the product of $0.40 and 6.
7

Holly earns $30 for babysitting 5 hours. She earns $28 when she does chores for 4 hours. Which compares the unit rates?

A
The unit rate for babysitting is $2 per hour more than the unit rate for doing chores.
B
The unit rate for babysitting is $1 per hour more than the unit rate for doing chores.
C
The unit rate for doing chores is $1 per hour more than the unit rate for babysitting.
D
The unit rate for doing chores is $2 per hour more than the unit rate for babysitting.
8

Geraldo gets paid the same amount for each hour he works. The graph shows the amount he is paid, y, as it relates to the number of hours he works, x. Yesterday, when he worked 6 hours, he was paid $84. Geraldo’s EarningsWhich ordered pair could represent the number of hours and amount Geraldo is paid today at the same hourly wage?

Question illustration
A
(3, 42)
B
(4, 60)
C
(5, 62)
D
(8, 100)
9

Kiesha and her classmates wrote proportions for the reduction of a triangle. Which proportions are set up correctly? Select three options.

Question illustration
A
StartFraction original height over original base EndFraction = StartFraction reduction height over reduction base EndFraction
Option A
B
StartFraction original height over reduction height EndFraction = StartFraction original base over reduction base EndFraction
Option B
C
StartFraction original height over reduction base EndFraction = StartFraction reduction height over original base EndFraction
Option C
D
StartFraction reduction height over reduction base EndFraction = StartFraction original height over original base EndFraction
Option D
E
StartFraction original height over original base EndFraction = StartFraction reduction base over reduction height EndFraction
Option E
10

If the relationship is proportional, what is the missing value from the table?xy–3–1–12?–30–10

A
–8
B
–6
C
–5
D
–4
11

Aimee noticed her plant grew of an inch every week since it sprouted. She created this graph to show its growth.Which statement about Aimee’s graph is true?

Question illustration
A
Aimee’s graph is correct because the ratio is equal to 2:3, which her graph shows in each point.
Option A
B
Aimee’s graph is incorrect because the ratio is equal to 3:2, so she should have switched her points.
Option B
C
Aimee’s graph is correct because it shows 3 inches of plant growth every two weeks.
D
Aimee’s graph is incorrect because it shows 2 inches of plant growth with each point instead of of an inch.
Option D
12

Abel planned for a garden to be 42 m long but found that it needs to be 24 m long to fit in his backyard. He found the change of scale below.Which is Abel’s error?

Question illustration
A
Abel should have written the ratio as .
Option A
B
Abel should have written the ratio as .
Option B
C
Abel should have divided both numbers by 6.
D
Abel should have divided both numbers by 4.
13

This graph shows a proportional relationship between the number of tulips and the number of daffodils in gardens planned by the Lindy Landscaping Company.Lindy Landscaping GardensWhat is the constant of proportionality?

Question illustration
A
0.2
B
0.5
C
2
D
5
14

Mrs. Santos is buying binders for the students in her class. She determined that 15 binders would cost $22.50.Cost of BindersIf all of the binders cost the same amount, which statement is true?

Question illustration
A
It will cost $12 for 18 binders.
B
It will cost $20 for 30 binders.
C
It will cost $42 for 28 binders.
D
It will cost $48 for 48 binders.
15

Jillian is trying to determine what helium tank pressure she needs to fill balloons for the student council dance. Find the unknown numbers in the table until you find the best answer to the question. Which cylinder pressure will Jillian need if she plans to fill 90 balloons?Tank Pressure and Balloon QuantityPressure in the helium cylinder (psi)Number of 9-inch balloons10030150?200?250?300?

A
150
B
200
C
250
D
300

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