To simplify \( \frac{t^{12}}{t^{6}} \), you need to subtract the exponents. According to the properties of exponents, when you divide two powers with the same base, you subtract the exponent of the denominator from that of the numerator:
\[ \frac{t^{12}}{t^{6}} = t^{12 - 6} = t^{6}. \]
So, the answer is to subtract the exponents.