Y Percent Increase , Decrease, and Error

Front

What is the formula to calculate a percent increase?

Back

Percent Increase = (New Value - Original Value) / Original Value × 100

Front

What is the formula to calculate a percent decrease?

Back

Percent Decrease = (Original Value - New Value) / Original Value × 100

Front

What does 'percent' mean?

Back

Percent means 'per hundred' and is a way to express a number as a fraction of 100.

Front

If you have 50 and it increases by 20%, what is the new value?

Back

New Value = 50 + (20% of 50) = 50 + 10 = 60

Front

If you have 80 and it decreases by 25%, what is the new value?

Back

New Value = 80 - (25% of 80) = 80 - 20 = 60

Front

What is 15% of 200?

Back

15% of 200 = 0.15 × 200 = 30

Front

In the statement '60% of what number is 24?', what are you looking for?

Back

You are looking for the 'whole'.

Front

If a shirt costs $40 and is on sale for 30% off, what is the sale price?

Back

Sale Price = $40 - (30% of $40) = $40 - $12 = $28

Front

What is the percent change if a population goes from 1,000 to 1,200?

Back

Percent Change = ((1,200 - 1,000) / 1,000) × 100 = 20% increase

Front

If a student scored 75 out of 100 on a test, what is the percentage score?

Back

Percentage Score = (75 / 100) × 100 = 75%