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The HCF (highest common factor) is the biggest number that divides two numbers exactly. The LCM (lowest common multiple) is the smallest number both divide into. Break each number into prime factors and both come out easily.
✓ You passed this lesson’s test.
Prime factors — “break each number into primes — the shared ones make the HCF, all of them make the LCM”
Use it for: Simplifying fractions, HCF/LCM questions in Class 5–10 maths, and aptitude and scholarship tests.
🧮 Check your own sums with the free HCF and LCM calculator — it shows the working.
Check: LCM = 36 × 48 ÷ 12 = 144, and 12 × 144 = 1728 = 36 × 48 ✓
▶ 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 🧱 Factor Builder badge when you pass — and a certificate when you finish all 10 lessons of Part 1 · Number skills. 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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