1. How to Make Them Yourself
Circle Graphs
How to Make Them Yourself
First, put your data into a table, then add up all the values to get a total:
Next, divide each value by the total and multiply by 100 to get a percent:
Comedy
Action
Romance
Drama
SciFi
TOTAL 4 5 6 1 20
4/20 = 20%
5/20 = 25%
6/20 = 30%
1/20 = 5%
100%

2. Percent of a Number (Review)
We can also use the percent to help us find the missing part or the whole. Example 1: If there are 20 coins in the collection, find 25% of the total coins. Example 2: If 80% of the collection is 20 coins, how many coins are in the collection?

3. Example 1: If there are 20 coins in the collection, find 25% of the total coins.
Step One: Identify which parts of the proportion you have. Step Two: Solving for the missing value by multiplying or dividing both the numerator and denominator by the same nonzero number. 25 % of the total collection is 5 coins.
25%
Part Whole
Percent
100 =
20 coins
5 coins
÷ 5
? 20 coins 25
100 =
÷ 5

4. Example 2: If 80% of the collection is 20 coins, how many coins are in the collection?
Step One: Identify which parts of the proportion you have. Step Two: Solving for the missing value by multiplying or dividing both the numerator and denominator by the same nonzero number. If 80% of the collection is 20 coins, there is 25 coins in the collection.
80%
20 coins
Part Whole
Percent
100 =
÷ 4
20 coins ? 80
100 =
25 coins
÷ 4