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Numbers ending in 7, 8 or 9 are just below a round number. Add the round number instead — that is easy — and then take back the little bit you added too much.
✓ You passed this lesson’s test.
Round up, then fix — “add the next round number, then take back the extra”
Use it for: Prices like ₹49 and ₹99, adding marks, and any sum with a 7, 8 or 9 in the ones place.
Check: 256 + 30 = 286, then 286 + 9 = 295 ✓
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 — and beat the clock: finish within 2 min 30 s.
🏅 Sign in with Google to earn the 🎯 Round-Up Racer badge when you pass — and a certificate when you finish all 5 lessons of Part 1 · Speed adding & subtracting. 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.