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When something grows — a price, a score, the members of a club — the percentage increase tells you how big the growth is compared with where it started. Always divide by the OLD (starting) value.
✓ You passed this lesson’s test.
Divide by the old — “percentage increase = increase ÷ old value × 100”
Use it for: Price rises, growth in marks or savings, population growth, and the Class 8 comparing-quantities chapter.
🧮 Check your own sums with the free Percentage calculator — it shows the working.
Check: 15% of 120 = 18, and 120 + 18 = 138 ✓
▶ Watch it animatedWork it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
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20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the 📈 Growth Spotter badge when you pass — and a certificate when you finish all 5 lessons of Part 3 · Percentage change. You can still take the test without signing in.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
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