Percent Change and 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 actual value.

Front

How do you calculate percent error?

Back

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

Front

If the actual speed is 38 mph and the estimated speed is 35 mph, what is the percent error?

Back

Percent Error = (|35 - 38| / 38) x 100% = 7.9%.

Front

If the estimated length is 32 in. and the actual length is 54 in., what is the percent error?

Back

Percent Error = (|32 - 54| / 54) x 100% = 40.7%.

Front

What is the formula for calculating percent decrease?

Back

Percent Decrease = ((Original Price - Sale Price) / Original Price) x 100%.

Front

If a scooter's regular price is $65.50 and the sale price is $52.40, what is the percent decrease?

Back

Percent Decrease = (($65.50 - $52.40) / $65.50) x 100% = 20%.

Front

What does a percent change of 11% indicate?

Back

It indicates that the new value is 11% greater than the original value.

Front

If Mrs. Ciampa had 27 students last year and 30 this year, what is the percent change in the number of students?

Back

Percent Change = ((30 - 27) / 27) x 100% = 11%.