Math Scale Factor

• 0.25
• 0.5
• 2
• 1/2

If the scale factor is greater than one, the new figure will be

• a reduction

• an enlargement

• a scale

• not proportional

The distance between two cities on a map is 4.125 inches.  Find the actual distance if the scale on the map is 2 inches = 40 miles.

• 165 miles

• 50 miles

• 82.5 miles

• 41.25 miles

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

• 21

• 1.25

• 20

• 4

Which rule would dilate shows a scale factor of 4

• (x, y) → (y, x)

• (x, y) → (x + 4, y + 4)

• (x, y) → (x, -y)

• (x, y) → (4x, 4y)

Quadrilateral NDMP was dilated to make N'D'M'P'. What was the scale factor?

• 2

• 3

• 1/3

• 1/2

Choose the correct scale factor:

• 2

• 3

• 1/3

• 1/2

Match the following dilations by a scale factor of 1/2.

• (5,1)

• (-6,-8)

• (0, -5)

• (6,8)

• (-3, -4)

• (10,2)

• (3,4)

• (0,0)

• (0,0)

• (0, -10)

Answer explanation

Note that 0/2 is still 0

so (0,0) dilated by 1/2 is still at (0,0)

(0,-10) dilated by a 1/2 is at

(0, -5)

The scale drawing car length is 3 cm. If the scale is 1 cm:4 ft, what is the actual car length?

• 12 feet

• 3 feet

• 3/4 feet

• 4 feet

Find the scale factor of the enlargement from A to B

• 2

• 1/2

• 3

• 4