What is 2.25 as a fraction?

2.25 as a fraction is equivalent to 9/4. This is because we can rewrite 2.25 as 2 + 0.25, and 0.25 can be expressed as a fraction as 25/100, which simplifies to 1/4. So, 2.25 is equal to 2 + 1/4, which is equivalent to 9/4.