Identifying proportional relationships

6 videos
1 skill
Learn how to tell whether two quantities are proportional by thinking about equivalent ratios and drawing graphs.

Intro to proportional relationships

VIDEO 3:50 minutes
Sal introduces the idea of a proportional relationship by looking at tables of values.

Is side length & perimeter proportional?

VIDEO 2:39 minutes
Sal answers the question by drawing a square and thinking about the relationship between side length and perimeter.

Is side length & area proportional?

VIDEO 3:46 minutes
Sal answers the question by drawing a square and thinking about the relationship between side length and area.

Proportional relationships: spaghetti

VIDEO 1:03 minutes
Given a table of ratios, watch as we test them for equivalence and determine whether the relationship is proportional.

Proportional relationships: movie tickets

VIDEO 1:46 minutes
When going to the movies, is the price you pay proportional to the number of tickets you buy?

Proportional relationships: bananas

VIDEO 2:57 minutes
A proportionality problem about eating bananas

Proportional relationships

PRACTICE PROBLEMS
Practice telling whether or not the relationship between two quantities is proportional by reasoning about equivalent ratios.