Changing Scales

What is the scale factor? (right to left)

• 100%

• 200%

• 50%

• 20%

Review: Compute the scale factor, as a percent, for each given relationship. When necessary, round your answer to the nearest tenth of a percent. Drawing 1 to Drawing 2:

• 2.10

• 210%

• 47.6

If you want to find the scale factor from one figure to another, which formula should you use?

• New/Original

• Original/New

• Part/Whole

From Denver to Chicago = 3 in. If the scale is 1 in = 300 miles, find the actual distance.

• 300 miles

• 1000 miles

• 900 miles

• 600 miles

You can find scale factor by using which formula?

• old measure/new measure

• length/volume

• volume/length

• new measure/old measure

The length of a rectangular prism changes from 6 feet to 18 feet.  What is the scale factor of the change?

• 1/3

• 3

• 2

• .3

Both the width and the volume of a rectangular prism change by a scale factor of 4.  If the old width was 5 ft and the old volume was 250 cubic ft, what is the new width and volume?

• 20 ft. and 1,000 cubic ft.

• 1.25 ft. and 62.05 cubic ft.

• 20 cubic ft and 1,000 ft.

• 625 ft and 3,906,250,000 cubic ft

The volume of a rectangular prism changes from 1,250 cubic inches to 125 cubic inches.  What is the scale factor of the change?

• 1/2

• 1/10

• 10

• 1/5

Whittemore Park Middle School is 30 feet tall. A 5 inch tall scale model of the school was made by the art club. What is the scale of the model?

• one inch = 6 feet

• one inch = 6 inches

• one inch = 72 inches

The actual length of a car is 14.5 ft. A model of the car is 7.25 inches long. What is the scale?

• one inch = 24 inches

• one inch = 2 ft

• one inch = 0.5 ft