Percent of Change By, Mrs. Muller.

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Presentation transcript:

Percent of Change By, Mrs. Muller

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.

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

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.

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.

Example 60 to 75

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