45/54 as a percentage is 83.33%. This number tells you how much of a whole the fraction represents when you look at it in terms of hundredths.
The fraction 45/54 can be reduced to 5/6, which is a common way to see the same value in a simpler form. Whether you write it as a fraction, a decimal, or a percentage, the size of the part stays the same.
Knowing the percentage helps when you compare this value to other percentages, like test scores or discount rates. It’s a quick way to see that 45/54 is just a little under five‑sixths of the whole, or about eighty‑three percent.