12/5 model problems 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 amount, expressed as a percentage.

Front

How do you calculate percent change?

Back

Percent Change = ((New Amount - Original Amount) / Original Amount) x 100.

Front

If the original amount is 16 and the new amount is 11, what is the percent change?

Back

31% decrease.

Front

What is percent error?

Back

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

Front

How do you calculate percent error?

Back

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

Front

If the estimated population is 17,600 and the actual population is 21,300, what is the percent error?

Back

17.4%.

Front

What does a negative percent change indicate?

Back

A negative percent change indicates a decrease in value.

Front

What does a positive percent change indicate?

Back

A positive percent change indicates an increase in value.

Front

If a game originally costs $66.64 and is on sale for $29.99, what is the percent change?

Back

54.9% decrease.

Front

If a student measures a length of 12 cm but the actual length is 14.25 cm, what is the percent error?

Back

15.79%.