How to solve a puzzle with numerals

Question

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 $3$?

Answer 1

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.

Answer 2

Just move the digit $2$ upward to the superscript position, so that it appears as an exponent of $10$ without adding an operator symbol.

Answer 3

The solution indeed uses exponents:

$103-10^2=3$

Answer 4

Alternative solution: use Roman numerals:

CIII - CII = III
         ^
         move this one

CIIII - CI = III
    ^
    to here

(or

CIII - CII = III
               ^
               move this one

CIIII - CII = II
    ^
    to here

)