Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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**soroban****Member**- Registered: 2007-03-09
- Posts: 452

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**JaneFairfax****Member**- Registered: 2007-02-23
- Posts: 6,868

Yep, I think I know why this works. You simply convert the number to be halved into base 2, which is a sum of powers of 2. When you multiply by the other number, its equivalent to multiplying each term in the sum by the other number and adding up.

In your example

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**soroban****Member**- Registered: 2007-03-09
- Posts: 452

Yes, you got it, Jane!

And a very nice explanation, too . . .

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**nirzhor****Member**- Registered: 2009-07-17
- Posts: 1

really this is cool.i have collected some cool technique to multiply but i want to know more.my collection is not a huge one but i want to make it huge so please help me sending cool math trick to me (nirzhorahmad@gmail.com)

you can watch my collection at http://funmath123.blogspot.com/

visit the site and throw your comment

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