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Numbers like 9, 19, 49 and 99 are just below a round number. Multiply by the round number, then take away the little bit you added.
✓ You passed this lesson’s test.
Round and adjust — “multiply by the round number, then take away the extra”
Use it for: Prices like ₹49, ₹99 and ₹199 — and any number that ends in 9 or 8.
Check: 6 × 49 = 6 × 40 + 6 × 9 = 240 + 54 = 294 ✓
Work it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
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 🎯 Round-Off Ranger badge when you pass — and a certificate when you finish all 9 lessons of Module 3 · Multiplication strategies. 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.
Prefer a real teacher? TalentJR teachers take live online classes anywhere in India and visit homes in selected cities. Tell us what you need and our team will call you with timings and fees.