10/18 as a percentage is 55.56%. This is the rounded value you get when you change the fraction into a percent form. It shows that a little more than half of a whole is represented by 10 out of 18.
The fraction 10/18 can also be simplified to 5/9, which still represents the same portion of a whole. Whether you use 10/18 or 5/9, the percentage stays the same because the amount of the whole hasn't changed.
Understanding this conversion helps when you need to compare parts of different sized groups. Knowing that 10/18 equals about 55.56% lets you quickly see that it’s just over the halfway point.