Unbelievably amazing, Cawdor. I remember doing this sort of thing myself when I was 14 or 15, not when I was 8! This is AWESOME! A cool thing that I discovered was that the sum of the digits of a product of two numbers is the same as product of the sum of the digits of the numbers. So, take 392 x 4978. Write that as (3+9+2)x(4+9+7+8) or ((1+4) x (2+8)) or 5 x 1 = 5. Now take their actual product which is 1951376. Add the digits to get 32 or 3 +2 = 5.
Thought your DS would like that!
Last edited by Lovemydd; 12/27/12 12:59 PM.
