two-term ratio- compares two quantities (things) measured in the same units.
three-term ratio- compares three quantities measured in the same units.
part to part ratio- compares different parts of a group to each other.
part to whole ratio- compares one part of a group to the whole group.
Example: apples to bananas, 7:20, red squares to total squares, 6:12
rate- compares two quantities in different units.
unit rate- a rate in which the second term is one.
unit price- a unit rate used when shopping.
Example: a person's heart can beat 64 beats/minute or a car can move 20 km/hr.
proportion- a relationship that says that two ratios or two rates are equal.
Example: you can use proportion to find out what a dozen erasers cost if three erasers cost $0.75. 2/3 = 6/9
Part 2: Wanna Buy An Eight Ernie?
Part 3: Wanna Buy A Rate Or Ratio?