C3.1.3.4 Percent Change, etc

Front

What is percent change?

Back

Percent change is a way to express how much a quantity has increased or decreased relative to its original value, calculated as (new value - old value) / old value × 100%.

Front

How do you calculate the percent of change?

Back

To calculate the percent of change, subtract the old value from the new value, divide the result by the old value, and then multiply by 100.

Front

What is the formula for percent decrease?

Back

Percent decrease = (old value - new value) / old value × 100%.

Front

What is the formula for percent increase?

Back

Percent increase = (new value - old value) / old value × 100%.

Front

If a quantity decreases from 80 to 64, what is the percent decrease?

Back

20%.

Front

If a quantity increases from 52 to 125, what is the percent increase?

Back

140%.

Front

What does a percent change of 0% indicate?

Back

A percent change of 0% indicates that there has been no change in value.

Front

How do you find the number of girls if 40% of 200 children are boys?

Back

If 40% are boys, then 60% are girls. 60% of 200 is 120 girls.

Front

What is the percent change when a car's value drops from $41,899 to $36,469?

Back

13% decrease.

Front

What does a negative percent change indicate?

Back

A negative percent change indicates a decrease in value.