Percent Change/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

What is percent error?

Back

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

Front

How do you calculate percent error?

Back

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

Front

If the price of an item decreases from $150 to $120, what is the percent change?

Back

Percent Change = ((120 - 150) / 150) x 100 = -20% (20% decrease).

Front

If a student's grade increases from 75 to 90, what is the percent increase?

Back

Percent Increase = ((90 - 75) / 75) x 100 = 20%.

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 Jessie estimated her cat's weight to be 8 pounds and the actual weight is 10 pounds, what is the percent error?

Back

Percent Error = (|8 - 10| / 10) x 100 = 20%.

Front

If Zed estimated there were 350 chips but found only 210, what is the percent error?

Back

Percent Error = (|350 - 210| / 210) x 100 = 66.67% (approximately 67%).