Step 1: Probability of first roll.
The die has 6 equally likely outcomes. Probability of rolling a 1 = \(\tfrac{1}{6}\).
Step 2: Probability of second roll.
Independence: the second roll is not affected by the first. Probability of rolling a 4 = \(\tfrac{1}{6}\).
Step 3: Combine independent events.
The probability of both happening = \(\tfrac{1}{6}\times\tfrac{1}{6}=\tfrac{1}{36}\).
Final Answer:
\[
\boxed{\tfrac{1}{36}}
\]