Percent Increase and Decrease. Warm Up Vocabulary.

Percent Increase and Decrease

Warm Up

Vocabulary

Amber got a raise, and her hourly wage increased from $8.00 to $9.50. What is the percent increase?

What does a 100% increase mean?

The price of a pair of shoes increases from $52.00 to $64.00. What is the percent increase to the nearest percent?

David moved from a house that is 89 miles away from his workplace to a house that is 51 miles away from his workplace. What is the percent decrease in the distance from his home to his workplace?

David considered moving even closer to his workplace. He claimed that if he had done so, the percent of decrease would have been more than 100%. Is David correct? Explain.

1. The number of students in a chess club decreased from 18 to 12. What is the percent decrease? Round to the nearest percent.

2. Officer Friendly wrote 16 tickets for traffic violations last week, but only 10 tickets this week. What is the percent decrease?

The grizzly bear population in Yellowstone National Park in 1970 was about 270. Over the next 35 years, it increased by about 115%. What was the population in 2005?

Why is percent of change always positive?

What would a negative percent of change mean?

If an amount of $100 in a saving account increases by 10%, then increases by 10% again, is that the same as increasing by 20%? Why or why not?

A TV has an original price of $499. Find the new price after a 10% increase.

What is the price had been decreased by 30%?

Percent Increase and Decrease. Warm Up Vocabulary.

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