1. 6.1 Ratios and Rates
By Michael N. Arfaras
Email: mnarfaras@gmail.com

2. Ratios
A ratio is the quotient of two quantities with the
same unit
Example: aspect ratios for televisions
4:3 16:9
Three ways
to write ANY
ratio:
4 to 3 16 to 9

3. Ratio Example: Cooking Rice
Yamanaka Tamaki, 2004
http://creativecommons.org/licenses/by-nc-nd/3.0/

4. Rates
A rate is the quotient of two quantities with
different units
Example: speed
Equivalent ways of expressing
ANY rate:
25 miles per 1 hour
or
25 miles per hour
Chad Elliott, 2011
http://creativecommons.org/licenses/by-sa/3.0/

5. Rate Example: Hourly Pay
A person’s hourly
earnings could be
$20 per hour
By 401K, 2011
http://creativecommons.org/licenses/by-sa/3.0/

6. Rates with a Denominator Other Than 1
Source: amazon.com, 2011
Source: amazon.com, 2011

7. For Additional Information…
See the textbook in which the definitions were
found:
Prealgebra and Introductory Algebra
An Applied Approach
Second Edition
By Aufmann and Lockwood