From: "Gerhard Postpischil" <gerh...@valley.net>
Sent: Thursday, 18 April 2013 1:19 AM
On 4/17/2013 9:14 AM, DASDBILL2 wrote:
I learned how to multiply in the third grade. Sixty years later I
still remember how to multiply. It's also important to know when,
why, and what to multiply.
Simple - you write the two numbers with the larger on the left. In the
next row, double the number on the left, and halve the number on the
right, discarding any fraction. Upon reaching 1 on the right, cross out
any row where the right number is even. Add the remaining rows on the left.
That's the ancient Chinese algorithm for multiplying,
using only division/multiplication by 2 and addition.
