Percent of Change and Percent of Error Practice

Front

What is Percent of Change?

Back

Percent of Change is a measure that describes how much a quantity has increased or decreased relative to its original amount, expressed as a percentage.

Front

How do you calculate Percent of Change?

Back

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

Front

What is the formula for Percent of Error?

Back

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

Front

If attendance increased from 2,376 to 2,950, what is the Percent of Change?

Back

Percent of Change = ((2950 - 2376) / 2376) x 100 = 24%.

Front

If Isabella estimated 430 passengers but there were actually 380, what is her Percent of Error?

Back

Percent of Error = (|430 - 380| / 380) x 100 = 13.16%.

Front

If Andy expected $60 but received $40, what is his Percent of Error?

Back

Percent of Error = (|60 - 40| / 60) x 100 = 33.33%.

Front

What does an increase in Percent of Change indicate?

Back

An increase in Percent of Change indicates that the new value is greater than the old value.

Front

What does a decrease in Percent of Change indicate?

Back

A decrease in Percent of Change indicates that the new value is less than the old value.

Front

If Mrs. Mroc's class size increased from 35 to 42, what is the Percent of Change?

Back

Percent of Change = ((42 - 35) / 35) x 100 = 20%.

Front

If you think a birthday card costs $4.50 but it actually costs $4, what is the Percent of Error?

Back

Percent of Error = (|4.50 - 4| / 4) x 100 = 12.5%.