Lesson 2: Proportions
In this lesson you will learn about proportions, their importance, how to set them up and how to solve them.
A proportion is an equivalent relationship of quantities.
We often use proportions to convert to or from percentages.
For example, what is 10% of 45?
We can set up a proportion: 45 corresponds to 100%, then what corresponds to 10%?
10 : 100 = n : 45
n = (45 x 10)/100
Additional practice will help you master the skills. Below is a note and more math practice on the topic.
PhET Interactive Simulations
University of Colorado Boulder