Scale Ratios

A ratio is

• comparing a bunch of numbers

• a comparison between 2 quantities

• an estimation of an amount

• a variable

Cindy’s job is to check computer printers for defects. Out of 420 printers she has to check, only 3 of the first 84 have been defective. Using this information, what is the best prediction of the TOTAL NUMBER OF DEFECTIVE PRINTERS?(Set up your ratio)

What is the ratio of apples to oranges? (Reduce any fractions!)

• 2:1

• 1:2

• 4:2

• 3:2

What is the ratio of apples to pieces of fruit?

What is the ratio of oranges to apples?

What is the ratio of oranges to fruit? (Reduce any fractions!)

• 1:2

• 2:1

• 1:3

• 3:1

What is the ratio of ducks to chicks (reduce any fractions!)

• 4:3

• 3:7

• 3:4

• 4:7

Solve for r.

• 1

• 16

• 12

• 18

Solve for x.

• 7

• 6

• 5

• 12

• 1:23

• 250:1

• 8:6

• 16:3