Find the Scale Factor Proportions

What is the scale factor from ΔDEF to ΔABC?

• 1/2

• 7/3

• 2

• 10/3

What is the scale factor from ABCD to MNOP?

• 2/3

• 3/2

• 2

• 3

What is the scale factor from MNOP to ABCD?

• 2/3

• 1/2

• 3/2

• 2

The two rectangles are scale drawings. What is the measurement of x?

• 21

• 1.25

• 20

• 4

A ski jump in a photograph is 3.5 inches in height. If the jump is 294 feet tall, what is the scale?    

• 1 in = 294 ft

• 1 in = 1029 ft

• 1 in = 84 ft

• 2 in = 294 ft

If the scale factor is 1 : 2.5, that means each side in figure B is 2.5 times as big as each side in figure A.

How long is side S?

Mathematical Equivalence

OFF

Hint: If the scale factor is 1:6 that means you multiply by 6.

Mathematical Equivalence

ON

If the scale factor is 1:2, that means each side in figure B is twice as big as each side in figure A.

Mathematical Equivalence

ON

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

• New/Original

• Original/New

• Part/Whole

A scale model of the Golden Gate Bridge in San Francisco Bay is built with a scale of 1 foot : 525 feet. If the main span of the bridge is 4, 200 feet long, what is the length of the main span in the model?

• 10 feet

• 3 feet

• 6 feet

• 8 feet