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A traditional number cube has 6 faces, with numbers 1, 2, 3, 4, 5, and 6.
The probability of rolling an even number on the first roll is 3/6 or 1/2 because there are 3 even numbers on the cube.
The probability of rolling an odd number on the second roll is also 3/6 or 1/2 because there are 3 odd numbers on the cube.
Therefore, the probability of both events happening (the first roll lands on an even number and the second roll lands on an odd number) is:
(1/2) * (1/2) = 1/4
So, the probability is 1/4.