A new riddle
111111111 * 111111111 = 12345678987654321
posted by Reza at 11:22 AM
Tuesday, August 02, 2005
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2 Comments:
It makes sense when you see it this way:
111111111 * 111111111 =
------------------------------
111111111 * (
__100000000
_+_10000000
_+___1000000
_+____100000
_+_____10000
_+______1000
_+_______100
_+________10
_+_________1 )
------------------------------
___11111111100000000
_+__1111111110000000
_+___111111111000000
_+____11111111100000
_+_____1111111110000
_+______111111111000
_+_______11111111100
_+________1111111110
_+_________111111111
------------------------------
___12345678987654321
Apologies for the terrible formatting. Treat the underscores as spaces. Blogged doesn't accept <pre> tags unfortunately.
-K
what a trick!
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