Percent of Change

Front

What is Percent of Change?

Back

Percent of Change is a way to express the difference between an old value and a new value as a percentage of the old value.

Front

How do you calculate Percent of Change?

Back

Percent of Change = ((New Value - Old Value) / Old Value) x 100.

Front

If a price decreases from $50 to $30, what is the percent of decrease?

Back

Percent of Decrease = ((50 - 30) / 50) x 100 = 40%.

Front

If a price increases from $20 to $25, what is the percent of increase?

Back

Percent of Increase = ((25 - 20) / 20) x 100 = 25%.

Front

What does a negative percent of change indicate?

Back

A negative percent of change indicates a decrease in value.

Front

What does a positive percent of change indicate?

Back

A positive percent of change indicates an increase in value.

Front

Lacey bought a new purse that originally cost $25 and is on sale for $15. What is the percent of change?

Back

Decrease of 40%.

Front

Mary decreased her time in the mile walk from 30 minutes to 24 minutes. What was the percent of decrease?

Back

20%.

Front

The 'Elf' movie is $12 and it will be on sale for $8. What is the percent of change?

Back

Decrease of 33%.

Front

In 2000, there were 17 sightings of great white sharks. In 2010, there were 32 sightings. What is the percent change?

Back

88%.