What is the theoretical probability a multiple of two when rolling a die?

When rolling a standard six-sided die, the multiples of two are 2, 4, and 6. There are three favorable outcomes (2, 4, and 6) out of a total of six possible outcomes (1, 2, 3, 4, 5, 6). Therefore, the theoretical probability of rolling a multiple of two is 3 out of 6, which simplifies to 1/2 or 50%.