Calculating Percent of Increase and Decrease Using Proportions

The video tutorial explains how to calculate the percent of change using proportions. It begins with an introduction to the concept of percent change and proportions, followed by an example involving population growth in Urbantown. The tutorial provides a detailed calculation of the percent increase and addresses common misunderstandings students may have when setting up proportions. The lesson emphasizes the importance of using the original amount as the denominator in calculations.

How do you calculate the percent of change using a proportion?

What was the population of Urbantown in 2012 and how much did it increase by in 2013?

What is the percentage of increase in the population of Urbantown from 2012 to 2013?

How can you visually represent the percent increase in population using a graph?

Explain why the original amount is used in the denominator when calculating percent of change.