Percent Change & 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 - Old Value) / Old Value) x 100.

Front

If the price of an item increases from $5 to $6, what is the percent change?

Back

Increase 20%.

Front

What is the formula for percent increase?

Back

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

Front

If an item sold for $20 and then for $50, what is the percent increase?

Back

150%.

Front

What is the formula for percent decrease?

Back

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

Front

If Ricky's math score changed from 80 to 86, what is the percent change?

Back

7.5% increase.

Front

How do you find the percent of change in a class size from 27 to 30?

Back

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

Front

What is percent error?

Back

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

Front

How do you calculate percent error?

Back

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