## Interest

on Jul 18, 2009

# Stumblers Who Commented On This Page

## OceanPacific921

### Mat

Stupid and slower.

## CptGiraffe

### CptGiraffe

Only 10 people in the world.

## brendonboshell

### Brendon

Russian Peasant's Algorithm. Scheme used for binary multiplication, because division by two is the same as a right bit shift (and x2, left bit shift)

## DonMacklin

### Don

Here's a curious way to multiply two numbers. Suppose we want to multiply 97 by 23. Write each at the head of a column. Now halve the first number successively, discarding remainders, until you reach 1, and double the second number correspondingly in its own column

## Zoron

### Zoron

OMG YOU DISCOVERED BINARY NUMBERS WOOWWW

## spoon737

### spoon737

This is called duplation and mediation (also Russian and Egyptian multiplication). It's not hard to prove why it works when you recognize that it's actually cleverly disguised binary multiplication.

## dirtbagbubble

### dirtbagbubble

It's called Russian multiplication. You can learn more about it here: http://mathforum.org/dr.math/faq/faq.peasant.html

## Jint3i

## ‽☠Victor☠‽

Get this in our schools.