TalentJR apps
Taking away 297 is hard; taking away 300 is easy. Round the number you take away up to a round number, subtract that, and then add back the little bit you took too much.
✓ You passed this lesson’s test.
Round up, add back — “take away a round number, then give back the extra”
Use it for: Prices like ₹298 or ₹495, any number ending in 7, 8 or 9, and quick change.
Check: 526 + 297 = 823 ✓
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 🔄 Boomerang Subtractor badge when you pass — and a certificate when you finish all 9 lessons of Part 4 · Bigger numbers, fractions and the calendar. 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.