Percent Change & Percent 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 - Original Value) / Original Value) x 100.

Front

What is Percent Error?

Back

Percent Error is a measure of how inaccurate a measurement is, expressed as a percentage of the difference between the estimated value and the actual value.

Front

How do you calculate Percent Error?

Back

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

Front

If a product's price increases from $50 to $75, what is the Percent Change?

Back

Percent Change = ((75 - 50) / 50) x 100 = 50% increase.

Front

If a student estimated a test score of 80 but actually scored 70, what is the Percent Error?

Back

Percent Error = (|80 - 70| / 70) x 100 = 14.3%.

Front

What does a positive Percent Change indicate?

Back

A positive Percent Change indicates an increase in value.

Front

What does a negative Percent Change indicate?

Back

A negative Percent Change indicates a decrease in value.

Front

If a car's value decreased from $20,000 to $15,000, what is the Percent Change?

Back

Percent Change = ((15,000 - 20,000) / 20,000) x 100 = -25%.

Front

What is the significance of Percent Error in scientific measurements?

Back

Percent Error helps to assess the accuracy of measurements and the reliability of experimental results.