1. Percent of Change
By, Mrs. Muller

2. Key Vocabulary Percent: A ratio that compares a number to 100
Proportion:
An equation stating that two ratios are equal.
Cross Product:
Multiplying the numerator of each ratio with the denominator of the other ratio.
Change:
Make or become different
Percent of Change: the percent a quantity increases or decrease from its original amount.

3. The Proportion Used Percent of Change Amount of Change Original Amount
100

4. Procedure First find the amount of change Second write a proportion.
Third write the cross products
Fourth use the division property of equality to isolate the variable.
Fifth step is to simplify.

5. Example
North Carolina had 12 seats in the U.S. House of Representatives in the 1990s. After the 2000 census, North Carolina had 13 seats. Find the percent of increase in the number of representatives.

6. Example
60 to 75

7. Let’s Practice 88 to 89 1.1% 2 to 7 250% 135 to 200 48.1% 12 to 63
425%