I completely stole this from iGoogle brainteasers.

 

Move one number to make this equation correct:

 

101-102=1

can I move the first '1', and lay it diagonally across the equals sign?

 

like this:

 

[math]01-102{\neq}1[/math]

 

sort of

101-102=1

 

(i.e. 101-10^2=1)

101-102=1

 

102-102=0

101=102-1

But that's not moving a number; was the original question set out with matches, toothpicks or some such?

No, it was just numbers, and brabos got it right. It's supposed to be 101-10^2=1. I do like Dak's idea, though.

i was gonna change 101-102=1 into 102-101=1. he said move one number, not one digit. last time i checked, 102 is a number.

But that's moving a number and a sign, not just a number, and would be quite similar to John's post (#5).

how did i move a sign??????

You moved the negative sign from 102 to the 101.