Five Minute Check

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(over Lesson 6-8)

Suppose you are making a scale drawing. Find the length of the object on the scale drawing with the given scale. Then find the scale factor. a subway car 34 feet long; 1 inch = 5 feet

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(over Lesson 6-8)

Suppose you are making a scale drawing. Find the length of the object on the scale drawing with the given scale. Then find the scale factor. a table 1.5 meters long; 3 centimeters = 0.25 meter

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(over Lesson 6-8)

Suppose you are making a scale drawing. Find the length of the object on the scale drawing with the given scale. Then find the scale factor. a football field that is 120 yards; 1 foot = 30 yards

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Main Idea and Vocabulary

Example 3:Use a Scale Model

Example 4:Find a Scale Factor

• scale factor – a scale written as a ratio without units in simplest form

• Solve problems involving scale drawings (2.3.8F, G) (M7.A.2.2).

Use a Scale Model

PHOTOGRAPHY A model is being created from a

picture frame which has a length of inches. If the

scale to be used is 8 inches = 1 inch, what is the

length of the model?

Write a proportion using the scale.

Scale Length

model

actual

model

actual

Use a Scale Model

Find the cross products.

38 =

m

Multiply.Answer: The scale model is 38 inches long.

Write as an

improper fraction.

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2. B

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FURNITURE A model is being created from a child-sized rocking chair which has a height of 8 inches. If the scale to be used is 12 inches = 1 inch, what is the height of the model?

A.

B.

C. 12 in.

D. 96 in.

Convert 3 feet to inches.

Find a Scale Factor

Find the scale factor of a blueprint if the scale is

Divide out the common units.

Multiply by to eliminate the

fraction in the numerator.

Find a Scale Factor

Answer: The scale factor is That is, each measure

on the blueprint is the actual measure.

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Find the scale factor of a blueprint if the scale is 1 inch = 4 feet.

Review

16 2/3 in.

1 1/3 in.

Review

1/48 2/3

End of the Lesson

Five-Minute Check (over Lesson 6–7)

Image Bank

Math Tools

Scale Drawings

Using Proportions