Percent Change and Error

Front

What is percent change?

Back

Percent change is a measure of how much a quantity has increased or decreased relative to its original value, expressed as a percentage.

Front

How do you calculate percent change?

Back

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

Front

Calculate the percent change from 73 feet to 79 feet.

Back

8.2% increase.

Front

What is percent error?

Back

Percent error is a measure of how inaccurate a measurement is, compared to the true value, expressed as a percentage.

Front

How do you calculate percent error?

Back

Percent Error = (|Estimated Value - Actual Value| / Actual Value) x 100.

Front

Meg estimated the weight of a rock to be 21 grams. When she weighed the rock, it was actually 23 grams. What was her percent error?

Back

8.7%.

Front

Calculate the percent change from 34 minutes to 48 minutes.

Back

41.2% increase.

Front

Calculate the percent change from 83 degrees to 75 degrees.

Back

9.6% decrease.

Front

Lou predicts tomorrow's temperature will be 72 degrees. It only reaches 66 degrees. What was his percent error?

Back

9%.

Front

What does a positive percent change indicate?

Back

A positive percent change indicates an increase in value.