What is 1.5 as a fraction?

1.5 as a fraction is 3/2. This is because 1.5 is equivalent to one and a half, and one and a half can be written as 1 + 1/2. Converting the whole number 1 to a fraction with a denominator of 2 gives us 2/2. Adding 2/2 and 1/2 gives us 3/2.