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To work out 2 2/5 + 1 4/5, change both to fifths: 12/5 + 9/5 = 21/5, and change back: 4 1/5. The same way works for subtracting — no borrowing worries.
✓ You passed this lesson’s test.
There and back — “change to improper fractions, work out, change back to a mixed number”
Use it for: Adding lengths, weights and times given as mixed numbers in Class 5–7.
🧮 Check your own sums with the free Fraction calculator — it shows the working.
Check: 2 + 1 = 3 wholes, 2/5 + 4/5 = 6/5 = 1 1/5, and 3 + 1 1/5 = 4 1/5 ✓
▶ 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 🥧 Mixed Number Master 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.
Sign in with Google to ask Free — 20 questions a day.
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