20 terms

Essential Question: How can you use rates to describe changes in real-life problems?

$1.25

How much does it cost for 1 bagel?

$30.00

How much does it cost for 2 dozen bagels? (Show work to support your answer.)

A rate is a ratio of two quantities using different units.

What is a rate?

A unit rate compares a quantity to one unit of another quantity. (Equivalent rates have the same unit rates)

What is a unit rate?

7:1 ($7 per week)

Write a unit rate for the situation:

$28 saved in 4 weeks

$28 saved in 4 weeks

6:1 (6 necklaces per hour)

Write a unit rate for the situation:

18 necklaces made in 3 hours

18 necklaces made in 3 hours

45:1 (45 miles per hour)

Write a unit rate for the situation:

270 miles in 6 hours

270 miles in 6 hours

19:1 (19 students per class)

Write a unit rate for the situation:

228 students in 12 classes

228 students in 12 classes

140:1 (140 kilobytes per second)

Write a unit rate for the situation:

2,520 kilobytes in 18 seconds

2,520 kilobytes in 18 seconds

110:1 (110 calories per serving)

Write a unit rate for the situation:

880 calories in 8 servings

880 calories in 8 servings

72:1 (72 miles per gallon)

Write a unit rate for the situation:

1,080 miles on 15 gallons

1,080 miles on 15 gallons

2.50:1 ($2.50 per ounce)

Write a unit rate for the situation:

$12.50 for 5 ounces

$12.50 for 5 ounces

100:1 (100 times per second)

Lightning strikes Earth 1,000 times in 10 seconds. How many times does lightning strike per second?

60:1 (60 times per minute)

Your heart beats 240 times in 4 minutes. How many times does your heart beat each minute?

$20.00

You earn $35 for washing 7 cars. How much do you earn for washing 4 cars? (Show work to support your answer.)

30 minutes

You jog 2 kilometers in 12 minutes. At this rate, how long will it take you to complete a 5 kilometer race? (Show work to support your answer.)

equivalent rates

Decide whether the rates are equivalent: (Show work to support your answer.)

24 laps in 6 minutes

72 laps in 18 minutes

24 laps in 6 minutes

72 laps in 18 minutes

rates are equivalent

Decide whether the rates are equivalent: (Show work to support your answer.)

126 points every 3 games

210 points every 5 games

126 points every 3 games

210 points every 5 games

not equivalent

Decide whether the rates are equivalent: (Show work to support your answer.)

15 breaths every 36 seconds

90 breaths every 3 minutes

15 breaths every 36 seconds

90 breaths every 3 minutes

yes, the rates are equivalent

Decide whether the rates are equivalent: (Show work to support your answer.)

$16 for 4 pounds

$1 for 4 ounces

(there are 16 ounces in 1 pound)

$16 for 4 pounds

$1 for 4 ounces

(there are 16 ounces in 1 pound)