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View Full Version : easy big square w/0 calculator


mepcotterell
Oct19-05, 06:03 PM
take any number, for example X and try and square it...

first let Y = X rounded up the nearest power, not multiple, of 10

[ X - (Y - X) ] * Y + (Y - X)^2 = X^2

it should work every time...

let X = 998

[ 998 - (1000 - 998) ] * 1000 + (1000 - 998)^2

[ 998 - 2 ] * 1000 + 2^2

996 * 1000 + 4

996000 + 4

996004

998^2 = 996004

you can do it for any number and it should work...

like 9999999999999999999999999999^2 is equal to 99999999999999999999999999980000000000000000000000 000001

HallsofIvy
Oct19-05, 07:38 PM
Yes, that's pretty trivial and pretty well known.

Mike AkA Don
Oct22-05, 10:56 PM
Yea I figured that out out of boredem in math last year... Its neat but not practical.