Posted By
Lavina
on 2007-01-09
07:59:51
 |  Re: LOL maths
In my childhood I also entertained myself finding such special occurances in maths...
For example I realized the following:
If you substract a two digit number XY from its reverse order 2 digit number YX, the absolute value of the result will be either one digit; always 9, (if x and y are not equal, of course), or two digits; the result's two digits Z and Q will follow this rule: Z+Q=9
54-45 = 9
96-69 = 27 (2+7=9)
59-95 = -36 (3+6=9)
I made some pretty nice magic tricks with this back in primary school.  I presume there are plenty of such things in maths.
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