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A fraction is in its simplest form (lowest terms) when no number except 1 divides both the top and the bottom. 12/18 is not: both divide by 6, and 12/18 = 2/3.
✓ You passed this lesson’s test.
Divide by the HCF — “the highest common factor takes a fraction to its simplest form in one step”
Use it for: Every fraction answer in school maths — teachers expect answers in simplest form — and ratio questions later.
🧮 Check your own sums with the free Fraction calculator — it shows the working.
Check: 2 × 6 = 12 and 3 × 6 = 18 ✓
▶ 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 ✂️ Simplest Form Star 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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