Fun with math

A Different Kind of Multiplication:

The Romans did not know anything about the binary system. They just knew that their method worked, which was good enough for them. Interestingly, electronic computers, which use binary numbers, employ a similar method!

A pretty interesting writeup of a method of multiplication that implicitly identifies the 1’s in any number’s binary expansion, and multiplies them be the corresponding number. A cool trick and a good way to teach yourself about binary.