In this lesson, you will practice interpreting pie charts. What is a pie?

A pie is a food dish that usually contains either fruit, meat, or vegetables and has a bottom and sometimes a top made out of pastry. It is usually round and divided into triangle-like slices, starting from the center to the outside edge. The picture above is of a pumpkin pie.

A pie chart is a round graph that uses pie-shaped wedges to represent the percentages of the whole.

Video Source (09:04 mins) | Transcript

Pie charts help us see how things compare to each other.

The bigger the slice of the pie chart, the higher the percentage of the whole it represents. The smaller the slice in the pie chart, the lower the percentage. The following pie chart represents the favorite colors of a group of people. The largest group of people represented by this pie chart like the color blue. Yellow is the least liked of the group.

The practice problems in this section help walk you through how to find percentages using data and a pie chart. You will need to know how to do this for the application activity.

## Additional Information

**Division: **

If we want to convert a certain number of hours in a day to a percentage, we would divide that number by 24 hours. For example, if we wanted to know how much of the day is represented by 8.4 hours, we would divide 8.4 hours by 24 hours. The result is:

\(\displaystyle \frac{8.4\: \text{hours}}{24\: \text{hours}} = 0.35\), which we can write as \(35\%\).

Notice that if we are dividing to calculate a percentage, the units in the numerator (hours) needs to be the same as the units in the denominator (hours). You can think of the units (hours) as “canceling” each other out.

**Multiplication:**

If we know that something is, say, 35% of a whole, then we can multiply 35% (or 0.35) by the total amount to find out how much 35% is of the total. For example, we learned that Daniel spends 35% of his day at work. This means that the number of hours he spent at work is the following:

\(0.35 \times 24\:\ {\text{hours}} = 8.4\:\ {\text{hours}}\)

### Practice Problems

**Answer the following question:**

- When compared to the other activities, in what activity does Daniel spend the greatest portion of his time? (Solution
- On what activity does Daniel spend the least amount of time? (Solution
- What percentage of time does Daniel spend either sleeping or working? (SolutionVideo Solution
- What percentage of time is Daniel with family and friends? (Solution
- How many hours does Daniel spend at work? (SolutionVideo Solution

## Need More Help?

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