Percentage Changes Using Calculators

Name:

Date:

🧮 Part 1: Multiplicative Method Practice

1. What decimal multiplier would you use to increase a number by 15%?

0.15

1.15

0.85

2. What decimal multiplier would you use to decrease a number by 25%?

0.25

1.25

0.75

3. Use your calculator to find the new price when $180 is increased by 12%.

Calculator sequence: _______ × _______ = _______

Answer: $ _______

4. Use your calculator to find the sale price when $250 is decreased by 18%.

Calculator sequence: _______ × _______ = _______

Answer: $ _______

🛍️ Part 2: Real-World Applications

5. A gaming console costs $450. The price increases by 8% due to high demand. What is the new price?

New price: $ _______

6. A clothing store offers a 30% discount on a jacket that originally costs $120. How much will you pay?

Sale price: $ _______

7. The population of a town increased from 15,000 to 16,800. Calculate the percentage increase.

Hint: Find the multiplier first, then convert to percentage

Percentage increase: _______%

8. A bicycle's price was reduced from $800 to $680. What was the percentage decrease?

Percentage decrease: _______%

🤔 Part 3: Problem Solving & Reflection

9. A $90 item is discounted by 20%, but then the sale price is increased by 20%. What is the final price? Is it the same as the original price? Explain your reasoning.

10. Explain in your own words why using the multiplicative method with a calculator is more efficient than calculating the percentage amount separately and then adding or subtracting.