Vedic maths · trick 11 of 36 · free

Multiply by 9, 99 and 999 — Vedic maths trick

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”.

The trick

Ekanyunena Purvena — “by one less than the one before”

  1. Write the number with as many digits as there are nines (add zeros in front if needed).
  2. Left part: the number minus 1.
  3. Right part: “all from 9 and the last from 10” of the number.
  4. 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.

Worked example: 47 × 99 = 4653

  1. 99 has two digits, and so does 47.
  2. Left part: 47 − 1 = 46.
  3. Right part: 9 − 4 = 5 and 10 − 7 = 3 → 53.
  4. Answer: 4653.

Check: 47 × 99 = 47 × 100 − 47 = 4700 − 47 = 4653 ✓

✏️ Practice

Work it out in your head or on paper, type the answer 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.

🖨️ Multiply by 9 and 99 Worksheet

✨ Free AI tutor

Ask the AI tutor about this trick

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.

👩‍🏫 Vedic maths classes near you — online or at home

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.

Live online classesSmall groups or 1:1 with a teacher, from home, any city.
Teacher at homeA TalentJR teacher visits your home (selected cities).
At a centreClasses at a TalentJR partner centre near you, where available.
Badges, certificates & gifts A badge for every trick you pass, a certificate for every part you finish, plus TalentJR Points for daily practice. Abacus course Younger child? Start with the free abacus course (ages 5–14).