SOL 8.CE.1.c Percent of Change

Front

What is Percent of Change?

Back

Percent of Change is a way to express how much a quantity has increased or decreased in relation to its original amount, calculated as (New Value - Original Value) / Original Value x 100%.

Front

How do you calculate the percent decrease?

Back

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

Front

How do you calculate the percent increase?

Back

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

Front

If a price decreases from $50 to $30, what is the percent decrease?

Back

Percent Decrease = (50 - 30) / 50 x 100% = 40%.

Front

If a population increases from 200 to 250, what is the percent increase?

Back

Percent Increase = (250 - 200) / 200 x 100% = 25%.

Front

What is the formula for finding the new value after a percent change?

Back

New Value = Original Value + (Percent Change x Original Value).

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.

Front

If a student scores 80 out of 100 on a test, what is the percent score?

Back

Percent Score = (80 / 100) x 100% = 80%.

Front

How do you interpret a percent change of -30%?

Back

A percent change of -30% indicates a decrease of 30% from the original value.

Front

What is the percent change when a stock price goes from $100 to $150?

Back

Percent Change = (150 - 100) / 100 x 100% = 50% increase.