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 increase?

Back

Percent increase = ((New Value - Original Value) / Original Value) x 100.

Front

How do you calculate percent decrease?

Back

Percent decrease = ((Original Value - New Value) / Original Value) x 100.

Front

What is the formula for percent error?

Back

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

Front

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

Back

150% increase.

Front

Ricky scored 80 in math and then 86. What is the percent change?

Back

7.5% increase.

Front

If the price of cheese goes from $5 to $6, what is the percent change?

Back

20% increase.

Front

You estimated sending 135 texts but sent 108. What is your percent error?

Back

20% error.

Front

Ms. Brown estimated 70 students for tryouts, but only 63 showed up. What is her percent error?

Back

11% error.

Front

What does a positive percent change indicate?

Back

A positive percent change indicates an increase in value.