To express 30 as a fraction in its lowest terms, we can write it as 30/1. This is because any whole number can be represented as a fraction by placing it over 1.
Next, we check if this fraction can be simplified. The greatest common divisor (GCD) of 30 and 1 is 1, which means there are no common factors to cancel out. Therefore, 30/1 is already in its simplest form.
In conclusion, 30 as a fraction in the lowest terms is 30/1.