March 2006
Number guessing puzzles
The first beautiful puzzle was by Yukio Yamamoto in Japan:
If you multiply two five digit numbers you can get the answer 123456789. Can you guess the two five digit numbers?
And the second, very similar puzzle:
SOLUTION
The answers are:
123456789 = (3 x 3607) x (3 x 3803) = 10821 x 11409
and
123456784 =(2 x 112 x 43) x (23 x 1483) = 10406 x 11864