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For 3/4 − 2/5, change both to twentieths (the LCM of 4 and 5): 15/20 − 8/20 = 7/20. Always take the smaller fraction from the bigger one.
✓ You passed this lesson’s test.
LCM, then take away — “change both fractions to the LCM of the bottoms, then subtract the tops”
Use it for: Finding differences and what is left in Class 5–7: juice left in a bottle, ribbon left after cutting.
🧮 Check your own sums with the free Fraction calculator — it shows the working.
Check: 7/20 + 8/20 = 15/20 = 3/4 ✓
▶ 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 🧮 Unlike-Fraction Subtractor badge when you pass — and a certificate when you finish all 6 lessons of Part 3 · Adding and subtracting fractions. 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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