A percent is a ratio of a part to the whole set. What makes a percent special is that the ratio is always given as a certain number of parts out of 100.

In this section, you will use a percent bar model to represent different percents of a given number. You will also think about different ways to calculate a percent or to use a percent to calculate a part or the whole.

A percent bar model consists of the following components.

In this model, 0 is at the left end of the percent bar, and 100%, or the whole set, is at the right end of the percent bar. The vertical line marking the part, which is *n*% of the whole, indicates the proportion of the percent bar representing the part.

Suppose that a store is having a sale on all merchandise. Depending on the type of item, shoppers will receive a particular discount.

Use the percent bar contained in the interactive below to set up and solve the percent problems that follow. Click on the image to open the interactive, which will open in a new browser tab or window.

- Enter the amount of the whole in the box in the upper right portion of the interactive.
- Drag the point marked on the percent bar to adjust the part.
- Use the information about the part and the percent to answer the question.

Need additional directions?

Use the interactive to answer the following questions.