How to solve a puzzle with numerals Any insights are welcome for this puzzle.


  The following equation is wrong: $103 - 102 = 3$. Move one numeral to make it correct. The numeral moved is: $0,1,2$ or $3$?
Konstantinos was on the right track.


   $$103 - 10^2 = 3$$


Since the question was "how to solve it", for any interested...

I solved it by first seeing that all the obvious a + b = c can be eliminated by seeing the range of the reduced or increased numbers.  Konst suggested exponents, which is the only other operator I can think of, $1$ is too small to be helpful, but 2 or 3 could work.
The solution indeed uses exponents:

$103-10^2=3$