Two term ratios and Three term ratio- compares two or three quantities measured in the same units.
Example: Two term ratios, orange balls to purple balls 3:5
Three term ratios, orange balls to red balls to purple balls 3:2:5
Rates- compares two quantities measured in different units.
example: $/orange= $1.99/orange
Proportional reasoning- a relationship that says two ratios or rates are equal
$/h $50/1h = $100/2h
Description: Lefty the salesman sells Ernie an "8"
Wanna buy a rate?