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 error?

Back

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

Front

What is the formula for calculating percent increase?

Back

Percent increase is calculated using the formula: ((New Value - Old Value) / Old Value) x 100.

Front

What is the formula for calculating percent decrease?

Back

Percent decrease is calculated using the formula: ((Old Value - New Value) / Old Value) x 100.

Front

If a price increases from $20 to $50, what is the percent increase?

Back

150%.

Front

If a school's population increases from 1250 to 2000 students, what is the percent increase?

Back

60%.

Front

If the price of cheese goes from $5 to $6, what is the percent change?

Back

Increase 20%.

Front

If Ms. Brown estimated 70 students would try out for the team, but only 63 did, what is her percent error?

Back

11%.

Front

What does a percent error of 20% indicate?

Back

It indicates that the estimated value was 20% off from the actual value.

Front

What is the difference between percent increase and percent decrease?

Back

Percent increase measures how much a value has grown, while percent decrease measures how much a value has shrunk.