From 1997 - James Martin's Numbers Game - This has got to be the most amazing numbers game answer ever - This video was originally hosted on another account. However, after his account was closed I thought I would upload this video. - All copyright remains with Yorkshire Television and ITV Productions - PLEASE COMMENT!
From 1997 - James Martin's Numbers Game - This has got to be the most amazing numbers game answer ever - This video was originally hosted on another account. However, after his account was closed I thought I would upload this video. - All copyright remains with Yorkshire Television and ITV Productions - PLEASE COMMENT!
He wants to go from 318 to 952, and he figures 3x318 - 2 = 952.
But! He doesn't have a 3 or a 2 at that point; he's just got 75, 50 and 25 left. He knows 75/25 = 3, and 50/25 = 2. But you can only use the 25 once. So in his mind he's thinking
3 x 318 - 2 = 952
(75/25) x 318 -- (50/25) = 952
So the only way to avoid using the 25 twice is to multiply & subtract first:
(75x318-50)/25 = 952
And he's worked that out without ever needing to know what 75x318 actually is.