Percent Change

Front

What is percent change?

Back

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

Front

How do you calculate percent increase?

Back

To calculate percent increase, use the formula: ((new value - old value) / old value) × 100%.

Front

How do you calculate percent decrease?

Back

To calculate percent decrease, use the formula: ((old value - new value) / old value) × 100%.

Front

If a class size increases from 27 to 30, what is the percent change?

Back

11% increase.

Front

If you have 13 friends and it increases to 14, what is the percent increase?

Back

8% increase.

Front

If Susie's hourly wage goes from $8.75 to $9.50, what is the percent change?

Back

9% increase.

Front

If the number of people signed up for a bus trip increases from 32 to 45, what is the percent increase?

Back

41% increase.

Front

If a score decreases from 90 points to 45 points, what is the percent decrease?

Back

50% decrease.

Front

What is the formula for finding the new value after a percent increase?

Back

New value = old value × (1 + percent increase).

Front

What is the formula for finding the new value after a percent decrease?

Back

New value = old value × (1 - percent decrease).