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Speed calculation · lesson 21 of 25 · free

What percent is it? — Speed Calculation

Scoring 18 out of 25 — what percent is that? Percent means "out of 100", so make the total 100. If the total fits into 100 (20, 25, 50), scale up. If it is a multiple of 100, scale down. Otherwise do part × 100 ÷ total.

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The fast method

Out of 100 — “percent means out of 100, so turn the total into 100”

  1. Total fits into 100? Scale up: 7 out of 20 → × 5 → 35 out of 100 = 35%.
  2. Total a multiple of 100? Scale down: 90 out of 300 → ÷ 3 → 30%.
  3. Otherwise: part × 100 ÷ total.

Use it for: Test marks as a percent, win rates in cricket, survey results, and percentage questions in Class 7–10.

🧮 Check your own sums with the free Percentage calculator — it shows the working.

Worked example: 27 out of 60 as a percent = 45

  1. 27 × 100 = 2700.
  2. 2700 ÷ 60 = 45.
  3. 45 out of 100 = 45%.

Check: 45% of 60: 10% = 6, so 40% = 24, 5% = 3, and 24 + 3 = 27 ✓

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✓ Written and checked by the TalentJR team · Updated 13 Oct 2026 · How we make our lessons

✏️ Practice

Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.

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🏁 Lesson 21 test

20 questions. Check each answer, then go to the next one. Get 16 or more right to pass — and beat the clock: finish within 4 min.

🏅 Sign in with Google to earn the 🥇 Score Scaler badge when you pass — and a certificate when you finish all 10 lessons of Part 4 · Speed decimals, fractions and percentages. You can still take the test without signing in.

🖨️ What Percent Worksheet – Marks to Percentage

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