Percent Change & Error

Front

What is percent change?

Back

Percent change is a way to express a change in a quantity as a percentage of the original amount. It is calculated using the formula: ((New Value - Old Value) / Old Value) x 100.

Front

How do you calculate percent decrease?

Back

To calculate percent decrease, use the formula: ((Old Value - New Value) / Old Value) x 100.

Front

How do you calculate percent increase?

Back

To calculate percent increase, use the formula: ((New Value - Old Value) / Old Value) x 100.

Front

What is the percent change if a quantity increases from 50 to 75?

Back

The percent change is 50%. Calculation: ((75 - 50) / 50) x 100 = 50%.

Front

What is the percent change if a quantity decreases from 200 to 150?

Back

The percent change is 25% decrease. Calculation: ((200 - 150) / 200) x 100 = 25%.

Front

If a product's price goes from $40 to $30, what is the percent decrease?

Back

The percent decrease is 25%. Calculation: ((40 - 30) / 40) x 100 = 25%.

Front

If a student's score increases from 80 to 100, what is the percent increase?

Back

The percent increase is 25%. Calculation: ((100 - 80) / 80) x 100 = 25%.

Front

What is the formula for calculating percent error?

Back

Percent error is calculated using the formula: (|Estimated Value - Actual Value| / Actual Value) x 100.

Front

If a measurement is estimated at 50 but the actual value is 45, what is the percent error?

Back

The percent error is 11.11%. Calculation: (|50 - 45| / 45) x 100 = 11.11%.

Front

What is the percent change if a population increases from 1000 to 1200?

Back

The percent change is 20%. Calculation: ((1200 - 1000) / 1000) x 100 = 20%.