multiplication using the Russian method as described in numberphile
refer to link (youtube) below
https://www.youtube.com/watch?v=HJ_PP5rqLg0
guest in video is Johnny Ball
also refer to Wolfram Alpha explanation:
http://mathworld.wolfram.com/RussianMultiplication.html
use import RussianMultiplication as rm thanks!
Wei 20/02/2020 23:56 GMT