Answer: The probability is 1/3
Explanation: I am guessing by "standard number cube" it means the classic six-sided dice. This dice has numbers 1 through 6 on each side. There are only 2 numbers less than or equal to two. 1 and 2. This means that 2/6 rolls will roll a 1 or 2. You can simplify by dividing the fraction by 2. This gives you 1/3.