Scale Factors Within Similar Shapes and Proportions

If a Scale Factor is between 0 and 1, then your figure gets...

• Smaller

•  Bigger

• Does not change

If a Scale Factor if greater than 1, then your figure gets...

• Smaller

• Bigger

• Does not change

Joe's picture of a dog was 5 inches by 6 inches.  He redrew it to be 20 inches by 24 inches.  His new drawing is  ___________ times larger.

• 6

• 5

• 4

• ¼

Joe's picture of a cat was  6 inches by 8 inches.  I copied it.  It is now 3 inches by 4 inches.  My copy is _____________of  the original.  

• ⅙

• ¾

• ¼

• ½

A scale model of a whale is being built. The actual length of the whale is 65 feet. The scale of the model is 2 in : 3 ft. What will be the length of the model?

• 97.5 inches

• 30.6 inches

• 41.56 inches

• 43.33 inches

• 24 in

• 96 in

• 72 in

• 62 in

A scale drawing of a billboard uses the scale 4 cm:9 ft. The length of the billboard in the drawing is 11 cm. How long is the actual billboard?

• 13 ft

• 20.75 ft

• 24.75 ft

• 22 ft

Solve the proportion.

• k=5

• k=3.3333333

• k=60

• k=90

The scale drawing of a giraffe has a scale in which 2 inches represents 15 feet. How tall is the actual giraffe?

• 14.25 ft

• 18.75 ft

• 18.65 ft

• 16.50

• 200 ft

• 12.5 ft

• 100 ft

• 50 ft