Final answer:
The probability of rolling a number less than 3 when rolling a number cube is 1/3.
Step-by-step explanation:
When rolling a number cube, there are six possible outcomes: 1, 2, 3, 4, 5, and 6.
The numbers less than 3 are 1 and 2. So, out of the six possible outcomes, two are less than 3.
To find the probability, we divide the number of favorable outcomes (less than 3) by the total number of possible outcomes (6).
Therefore, the probability of rolling a number less than 3 is 2/6, which simplifies to 1/3.