Percentage Change Textbook Exercise - Corbettmaths - Free Printable

Sure! Let’s solve each question step by step using the percentage change formula:

> Percentage Change = (Change in Value / Original Value) × 100%

If the result is positive → percentage increase
If the result is negative → percentage decrease

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✔ Question 1: Puppy’s weight increase

- Original weight = 4 kg
- New weight = 5 kg
- Change = 5 - 4 = 1 kg

> Percentage increase = (1 / 4) × 100% = 25%

✔ Answer: 25%

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✔ Question 2: TVs sold increased from 50 to 60

- Original = 50
- New = 60
- Change = 60 - 50 = 10

> Percentage increase = (10 / 50) × 100% = 20%

✔ Answer: 20%

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✔ Question 3: Peter’s weight decreased from 80kg to 72kg

- Original = 80 kg
- New = 72 kg
- Change = 72 - 80 = -8 kg (negative because it’s a decrease)

> Percentage decrease = (8 / 80) × 100% = 10%

*(Note: We use the absolute value of the change for “percentage decrease” — so we say 8/80, not -8/80)*

✔ Answer: 10%

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✔ Question 4: Car speed increased from 40 km/h to 56 km/h

- Original = 40
- New = 56
- Change = 56 - 40 = 16

> Percentage increase = (16 / 40) × 100% = 40%

✔ Answer: 40%

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✔ Question 5: Keira’s profit on coffee table

- Cost price = £120
- Selling price = £204
- Profit = 204 - 120 = £84

> Percentage profit = (Profit / Cost Price) × 100%
= (84 / 120) × 100% = 70%

✔ Answer: 70%

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## 📌 Final Answers:

1. 25%
2. 20%
3. 10%
4. 40%
5. 70%

Let me know if you’d like to see these explained with diagrams or real-life analogies! 😊