To express 135 as a mixed number, we first need to understand what a mixed number is. A mixed number consists of a whole number and a proper fraction. In this case, since 135 is already a whole number, we can express it as a mixed number by incorporating a fraction of 0.
Therefore, 135 can be represented as:
135 = 135 0/1
This emphasizes that while the number is a whole, any fraction can be added as long as it equals zero, thus it maintains the integrity of the original whole number.