To convert the improper fraction \( \frac{143}{1} \) into a mixed number, we first note that there is no integer part since the denominator is 1. Thus, the fraction can be expressed directly as a whole number:
\[ \frac{143}{1} = 143 \]
Therefore, as a mixed number, it can be represented as:
\[ 143 \frac{0}{1} \]
However, in standard terms, it is simply \( 143 \). There isn’t a fractional part since the denominator is 1. So, the mixed number form is just:
\[ 143 \]