What is 4.5 as a fraction?

To express 4.5 as a fraction, we can first write it as a mixed number: 4 1/2.

To convert this into an improper fraction, we multiply the whole number (4) by the denominator (2) and add the numerator (1) to get the new numerator, giving us 9.

So, 4.5 can be written as the fraction 9/2.