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When something falls — water in a tank, runs in a match, a price in a sale — the percentage decrease compares the fall with the starting value.
✓ You passed this lesson’s test.
The old value is 100% — “percentage decrease = decrease ÷ old value × 100”
Use it for: Price cuts, water or fuel used up, falling scores, and the value of things going down over time.
🧮 Check your own sums with the free Percentage calculator — it shows the working.
Check: 15% of 80 = 12, and 80 − 12 = 68 ✓
▶ Watch it animatedWork it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
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 📉 Drop Detective 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.
Sign in with Google to ask Free — 20 questions a day.
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