1. 7.1 Proportions
Ratio: A comparison of two quantities using division.

2. Proportion
When you set two ratios equal to each other then you have a proportion.
The means are the numbers 8 and 6.
The extremes are the numbers 4 and 12.
The cross product of the means = the cross product of the extremes.
(a.k.a. cross multiplication)

3. Khan Academy Video Ratio and Proportion

4. Solving a Proportion 8
Cross multiply 3
Divide by 9

5. Travel & Money
Countries have different monetary systems. If 35 Taiwanese dollars = 1 US dollar, find out how many US dollars it would cost to take a tour in Taiwan for 600 Taiwanese dollars.

6. Homework
#45 p even, 28-29, 42, 47-48