- FINGERNAILS On average, fingernails grow
0.02 inch per week. Write this rate using whole
numbers.
- INTERNET SALES A website determined that it
had 112,500 hits in one month. Of those visiting the
site, 4,500 made purchases.
a. Those that visited the site, but did not make a
purchase, are called browsers. How many
browsers visited the website that month?
b. What was the browsers-to-buyers unit rate for
the website that month?
- TYPING A secretary typed a document containing
330 words in 5 minutes. Write this rate as a unit
rate.
- UNIT PRICES A 12-ounce can of cola sells for 84¢.
Find the unit price in cents per ounce.
- DAYCARE A daycare center charges $32 for
8 hours of supervised care. Find the unit price in
dollars per hour for the daycare.
- PARKING A parking meter requires 25¢ for
20 minutes of parking. Find the unit price to
park.
- GASOLINE COST A driver pumped 17 gallons of
gasoline into the tank of his pickup truck at a cost of
$32.13. Find the unit price of the gasoline.
- LANDSCAPING A 50-pound bag of grass seed sells
for $222.50. Find the unit price of grass seed.
- UNIT COSTS A 24-ounce package of green
beans sells for $1.29. Find the unit price in cents
per ounce.
- DRAINING TANKS An 11,880-gallon tank of
water can be emptied in 27 minutes. Find the unit
rate of flow of water out of the tank.
- PAY RATE Ricardo worked for 27 hours to help
insulate a hockey arena. For his work, he received
$337.50. Find his hourly rate of pay.
- AUTO TRAVEL A car’s odometer reads 34,746 at
the beginning of a trip. Five hours later, it reads 35,071.
a. How far did the car travel?
b. What was its rate of speed?
- RATES OF SPEED An airplane travels from
Chicago to San Francisco, a distance of 1,883 miles, in
3.5 hours. Find the rate of speed of the plane.
- COMPARISON SHOPPING A 6-ounce can of
orange juice sells for 89¢, and an 8-ounce can sells
for $1.19. Which is the better buy?
- COMPARISON SHOPPING A 30-pound bag of
planting mix costs $12.25, and an 80-pound bag costs
$30.25. Which is the better buy?
- COMPARISON SHOPPING A certain brand of
cold and sinus medication is sold in 20-tablet boxes
for $4.29 and in 50-tablet boxes for $9.59. Which is
the better buy?
- COMPARISON SHOPPING Which tire shown is
the better buy?
- COMPARING SPEEDS A car travels 345 miles in
6 hours, and a truck travels 376 miles in 6.2 hours.
Which vehicle is going faster?
- READING One seventh-grader read a 54-page
book in 40 minutes. Another read an 80-page book
in 62 minutes. If the books were equally difficult,
which student read faster?
- GAS MILEAGE One car went 1,235 miles
on 51.3 gallons of gasoline, and another went
1,456 miles on 55.78 gallons. Which car got the
better gas mileage?
- ELECTRICITY RATES In one community,
a bill for 575 kilowatt-hours of electricity is
$38.81. In a second community, a bill for 831 kwh
is $58.10. In which community is electricity
cheaper?
- Are the ratios 3 to 1 and 1 to 3 the same? Explain
why or why not.
- Give three examples of ratios (or rates) that you
have encountered in the past week.
- How will the topics studied in this section make you
a better shopper?
- What is a unit rate? Give some examples.
Use front-end rounding to estimate each result.
- 12,897 + 29,431 + 2,595
- 63,4673,103
410 21
6,302 788
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