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If 2/5 of a number is 12, then 2 equal shares make 12, so one share is 6. The whole has 5 shares: 30. This is the fraction-of-a-number idea run backwards.
✓ You passed this lesson’s test.
Back to one part — “from the part, find one share, then build the whole”
Use it for: Pocket money and price questions, class strength questions and Olympiad puzzles (Class 6–8).
🧮 Check your own sums with the free Fraction calculator — it shows the working.
Check: 2/5 of 30 = 30 ÷ 5 × 2 = 12 ✓
▶ 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 🧱 Whole Builder badge when you pass — and a certificate when you finish all 6 lessons of Part 4 · Multiplying, dividing and word problems. 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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