TalentJR apps
A bar over a digit means that digit is taken away. Writing 9s and 8s as bars (19 = 21̅) turns big digits into small ones, and turning bar numbers back into ordinary numbers is a quick “all from 9 and the last from 10”.
✓ You passed this trick’s test.
Nikhilam Navatashcaramam Dashatah — “all from 9 and the last from 10”
Use it for: Reading bar numbers, and making multiplication easier: 98 = 10 (100 − 2), so 98 × 7 = 700 − 14 = 686.
Check: 5000 − 300 − 20 + 1 = 4681 ✓
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 sums. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the 📏 Vinculum Voyager badge when you pass — and a certificate when you finish all 6 tricks of Part 4 · Algebra & number sense. 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.