To solve \( 6 \div \frac{1}{3} \), we can use the rule that dividing by a fraction is the same as multiplying by its reciprocal. The reciprocal of \( \frac{1}{3} \) is \( 3 \). Therefore:
\[ 6 \div \frac{1}{3} = 6 \times 3 = 18 \]
So the answer is:
18