Math 7 Lesson 46 Rates

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Mathematics

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7th - 8th Grade

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natalie richardson

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5 Slides • 4 Questions

Math 7 Lesson 46 Rates

A rate is a rtio, a comparison of two numbers.

If two apples can be purchased for 16 cents, we can write either:

$\ \frac{16\ cents}{2\ apples}$
$\frac{2\ apples}{16\ cents}$

Another way to write it is using "per"

1/8 apple per cent or 8 cents per apple
65 miles per hour $\frac{65\ miles}{1\ hour}$
25 miles per gallon $\frac{25\ miles}{1\ gallon}$
$12 per hour $\frac{12\ dollars}{1\ hour}$

Rate

The rate of speed is always found by dividing distance travelled by time.

UNIT PRICE

A unit price is the cost for a single unit of a product. It is a ratio of price to quantity.

Multiple Choice

Arnold drove 390 miles from Los Angeles to Sacramento in 6 hours. What was his average rate of speed?

65 mph

55 mph

40 mph

60 mph

Multiple Choice

On the 390 miles trip Arnold's car used 15 gallons of gas. His car averaged how many miles per gallon for the trip?

26 mpg

25 mpg

35 mpg

36 mpg

Multiple Choice

Jarrod was paid $480 for 30 hours of work. What was jarrod's hourly rate of pay?

$16 per hour

$18 per hour

$15 per hour

$12 per hour

Multiple Choice

What is the unit price of a 24-ounce box of cereal priced at $3.60?

15 cents per ounce

16 cents per ounce

14 cents per ounce

18 cents per ounce

Math 7 Lesson 46 Rates

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