I can multiply any three-digit number by 1667 in my head, usually in less than 10 seconds.
Also, to make it even more impressive, I come up with the digits of the result in proper order (not in reverse!)
How can I do this?
When the author says "...starting with the most significant number", I'm sure she means the most significant digit of the answer.
Posted by Charlie
on 2003-10-05 11:22:39