1. 5
Chapter
Chapter 2
Ratio, Proportion, and Measurement

2. Section
5.1
Ratios

3. Write Ratios as Fractions.
Objective A
Write Ratios as Fractions.

4. Writing Ratios as Fractions
A ratio is a quotient of two quantities.
1 to 2 or or 1 : 2
Writing a Ratio as a Fraction
The order of the quantities is important when writing ratios. To write a ratio as a fraction, write the first number of the ratio as the numerator of the fraction and the second number as the denominator.
Objective A

5. Example Write the ratio 15 to 23 using fractional notation.
Objective A Continued

6. Example Write the ratio of $25 to $15 as a fraction in simplest form.
Objective A Continued

7. Example Write the ratio of 10.3 to 15.1 using fractional notation.
Objective A Continued

8. Example Write the ratio of 2.6 to 3.1 as a fraction in simplest form.
Objective A Continued

9. Example
Write the ratio of 2 2/3 to 1 13/15 as a fraction in simplest form.
Objective A Continued

10. Example Given the rectangle shown:
a. Find the ratio of its width to its length.
b. Find the ratio of its length to its perimeter. a.
b. Perimeter = = 24 feet
7 feet
5 feet
Objective A Continued

11. Write Rates as Fractions.
Objective B
Write Rates as Fractions.

12. Writing Rates as Fractions
A special type of ratio is a rate. A rate is used to compare different kinds of quantities.
Objective A

13. Example Write the rate as a fraction in simplest form.
10 nails every 6 feet
Objective A Continued

14. Example Write each rate as a fraction in simplest form.
1. $2160 for 12 weeks
miles on 16 gallons of gasoline
Objective A Continued

15. Objective C
Find Unit Rates.

16. Finding Unit Rates A unit rate is a rate with a denominator of 1.
55 miles per hour is an example of a unit rate.
Write a Rate as a Unit Rate
To write a rate as a unit rate, divide the numerator of the rate by the denominator.
Objective A Continued

17. Example Write as a unit rate: $31,500 every 7 months The unit rate is
Objective A Continued

18. Objective D
Find Unit Prices.

19. Finding Unit Prices
A unit rate is “money per item,” it is also called a unit price.
Objective A Continued

20. Example
A store charges $4.80 for a 32-ounce container of laundry soap. What is the unit price in dollars per ounce?
Objective A Continued

21. Example
Approximate each unit price to decide which is the better buy: 4 bars of soap for $0.99 or 5 bars of soap for $1.19.
Objective A Continued
Thus the 5-bar package is the better buy.