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infected glue on wooden parsley robots
Wednesday, March 24, 2004
Now this site has some really interesting math info. I didn't see my favorite math trick there, but I'll give it as an example of what their site is all about.
Take any 3 digit, nonrepeating (ie 444), number and subtract the reverse:
745-547=198
The answer will be such that the digit in the hundreds place and the digit in the ones place add up to 9 and the digit in the tens place will always be 9.
198 -> 1+8=9 w/ 9 in the tens place.
This works even if the answer is negative or if either the hundred's place digit is 0 (the one's place digit will be 9)
You can tell someone to pick a random 3 digit number and subtract the reverse. Then have them give you either the one's place number or the hundred's place number. Using this method, you can tell them the answer without ever knowing the original numbers.
I love this kind of crap.
Take any 3 digit, nonrepeating (ie 444), number and subtract the reverse:
745-547=198
The answer will be such that the digit in the hundreds place and the digit in the ones place add up to 9 and the digit in the tens place will always be 9.
198 -> 1+8=9 w/ 9 in the tens place.
This works even if the answer is negative or if either the hundred's place digit is 0 (the one's place digit will be 9)
You can tell someone to pick a random 3 digit number and subtract the reverse. Then have them give you either the one's place number or the hundred's place number. Using this method, you can tell them the answer without ever knowing the original numbers.
I love this kind of crap.
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