Percent Change and Error - Check In

Front

What is percent change?

Back

Percent change is a way to express a change in a quantity as a percentage of the original amount. It is calculated using the formula: ((new value - old value) / old value) x 100.

Front

How do you calculate percent decrease?

Back

To calculate percent decrease, use the formula: ((old value - new value) / old value) x 100.

Front

What is percent error?

Back

Percent error is a measure of how inaccurate a measurement is, compared to the true value. It is calculated using the formula: (|estimated value - actual value| / actual value) x 100.

Front

If a price decreases from $60 to $36, what is the percent decrease?

Back

40% decrease.

Front

If an estimated age of a fossil is 520 years and the actual age is 500 years, what is the percent error?

Back

4% error.

Front

What is the formula for calculating percent increase?

Back

Percent increase is calculated using the formula: ((new value - old value) / old value) x 100.

Front

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

Back

20% decrease.

Front

How do you find the percent of change in a class size from 35 to 42 students?

Back

Percent change = ((42 - 35) / 35) x 100 = 20% increase.

Front

What is the percent error if you estimated 350 chips but found only 210?

Back

Percent error = (|350 - 210| / 350) x 100 = 40%.

Front

What does a percent change of 0% indicate?

Back

A percent change of 0% indicates that there has been no change in the value.