Jocelle's Semame Street Video

RATIO :

Two Term Ratio - compares two quantities measured in the same unit.
Example - White Cookies: Blue Cookies
1:2

Three Term Ratio - compares three quantites measured in the same unit.
Example : White Cookies: Blue Cookies: Pink Cookies
1:2:3

Part to Part Ratio - compares different parts of the group to the whole group.
Example: White Cookies:Yellow Cookies
1:7

Part to Whole ratio - compares one part of a group to the whole group. It can be written in a decimal, fraction and percent.
Example: Purple Cookies : Total Cookies 8:21

Rate:

Rate- compares two quantites measured in different units

Unit rate- a rate in which the second term is 1

Unit price - a rate used when shopping

Proportional Reasoning :

Proportional Reasoning - a relationship that says that two ratios and two rates are equal. It can be written in a fraction form.

http://www.youtube.com/user/spmath789#p/u/4/r2vYfx5ff1w