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A rational number is a fraction p/q of integers with q not zero, such as −3/4 or 5/(−7). In standard form the denominator is positive and the fraction is in lowest terms: 12/(−18) = −2/3. To compare or add rational numbers, give them the same positive denominator and then work with the numerators, using the rules of signs.
✓ You passed this lesson’s test.
Common denominator, then signs — “make the denominators the same, then add the numerators with the rules of signs”
Use it for: Temperatures and heights in fractions, money gained and lost, and the rational numbers chapter of Class 7 maths.
🧮 Check your own sums with the free Ratio calculator — it shows the working.
Check: −1/4 − 1/2 = −1/4 − 2/4 = −3/4 ✓
▶ Watch it animatedWork it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
20 sums. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the 🪙 Rational Ranger badge when you pass — and a certificate when you finish all 8 lessons of Part 7 · Class 7. 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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