Percent Change and Error - Check In

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. It is calculated using the formula: Percent Error = |(Estimated Value - Actual Value)| / Actual Value * 100.

Front

How do you calculate percent error?

Back

To calculate percent error, subtract the actual value from the estimated value, take the absolute value of that difference, divide by the actual value, and multiply by 100.

Front

If Zed estimated 350 chips but found 210, what is his percent error?

Back

67%.

Front

What is the formula for percent change?

Back

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

Front

If Mrs. Mroc's class size increased from 35 to 42 students, what is the percent change?

Back

20% increase.

Front

What does a percent increase indicate?

Back

A percent increase indicates how much a value has grown compared to its original amount, expressed as a percentage.

Front

What does a percent decrease indicate?

Back

A percent decrease indicates how much a value has shrunk compared to its original amount, expressed as a percentage.

Front

If the price of a scooter decreased from $65.50 to $52.40, what is the percent decrease?

Back

20%.

Front

How do you find the percent decrease?

Back

To find the percent decrease, subtract the new value from the old value, divide by the old value, and multiply by 100.

Front

If a softball glove's price decreased from $60 to $36, what is the percent decrease?

Back

40%.