2.  A comparison of two quantities  Often expressed as a fraction

3.  The ratio of the age of a 34 year old parent to that of a 10 year old child is 34 to 10  Also can be written as:  34: 10   3.4

4.  An equation that states that two ratios are equal  Examples:

5.  To solve proportions, we will cross multiply

6.  Example:

10. The property tax on a house is $8 per $1000 assessed valuation. What is the tax on a house assessed at $165,000?

11. A certain car can travel 180 miles on 8 gallons of gasoline. How far can this car travel on 19 gallons of gasoline?

12. The scale on a map says that 0.5 cm represents 25 km. On the map the measurement between two cities is 5 cm. What is the actual distance between the cities?

13. Pg. 150 #’s 2 – 16 even; 25 - 29