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When the tops and bottoms are all different, like 3/4 and 5/7, cross-multiply: 3 × 7 = 21 and 5 × 4 = 20. The fraction on the side of the bigger product is bigger. Equal products mean equivalent fractions.
✓ You passed this lesson’s test.
Cross-multiply — “top of each × bottom of the other; the bigger product belongs to the bigger fraction”
Use it for: Comparing unlike fractions in Class 5–7, best-buy questions, and Olympiad comparison questions.
🧮 Check your own sums with the free Fraction calculator — it shows the working.
Check: 3/4 = 21/28 and 5/7 = 20/28 ✓
▶ 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 🔀 Cross-Multiply Champ badge when you pass — and a certificate when you finish all 6 lessons of Part 2 · Equivalent fractions and comparing. 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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