The Nifty 9s Multiplication Trick

Ever struggled to quickly multiply by 9? What if you could do it almost instantly, without a calculator? Get ready to amaze yourself!

Subject: mental-calculation • Classes: 6–12 • Difficulty: basic

The Trick

To multiply any number by 9, simply multiply that number by 10, then subtract the original number. That's it! \ For example, for $9 \times N$, calculate $10 \times N - N$. This works because $9 = 10 - 1$, so $9 \times N = (10 - 1) \times N = 10N - N$. Super fast, super simple!

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