The finger trick for 9 only works up to 9 × 10. This Vedic trick multiplies any number by 9, 99 or 999 — you only take away 1 and use “all from 9 and the last from 10”.
Ekanyunena Purvena — “by one less than the one before”
Write the number with as many digits as there are nines (add zeros in front if needed).
Left part: the number minus 1.
Right part: “all from 9 and the last from 10” of the number.
More digits than the nines (237 × 99)? Split off as many digits as there are nines (2 | 37): left = number − (front part + 1) = 234, right = complement of 37 = 63 → 23463.
Use it for: Any number times 9, 99 or 999. For 47 × 999 write 047: 46 | 953 = 46953. For 237 × 99: 234 | 63 = 23463.
Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
🏁 Trick 11 test
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
🪄 Nines Wizard badge when you pass — and a certificate when you finish all 10 tricks of
Part 2 · Advanced tricks. You can still take the test without signing in.
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