Percent increase and decrease are ways to describe how much a quantity changes. Percent increase is used when a quantity goes up, and percent decrease is used when a quantity goes down. To calculate the percent change, you find the difference between the new value and the original value, divide by the original value, and then multiply by 100 to express it as a percentage. Understanding these concepts is super useful in everyday life, from calculating discounts to understanding economic trends. This quiz will help you practice these important skills!
Match the term with its definition:
| Term | Definition |
|---|---|
| 1. Original Value | A. The starting amount before any change. |
| 2. New Value | B. The amount after the increase or decrease. |
| 3. Percent Increase | C. The percentage by which a quantity has increased. |
| 4. Percent Decrease | D. The percentage by which a quantity has decreased. |
| 5. Percent Change | E. The general term for percent increase or decrease, calculated as $\frac{\text{New Value} - \text{Original Value}}{\text{Original Value}} \times 100$. |
Complete the following paragraph using the words provided: increase, decrease, original, new, percent.
To calculate the ______ change, you need to know the ______ value and the ______ value. If the new value is higher than the original value, it's a ______ . If the new value is lower, it's a ______. The formula helps you find the ______ change.
Explain, in your own words, why understanding percent increase and decrease is important in everyday life. Give at least two real-world examples.
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