10/18 as a percentage is 55.56%. This is the rounded value you get when you express the fraction as a part of a whole.
The fraction 10/18 can be reduced to 5/9, which still represents the same proportion of a whole. Whether you write it as 10/18, 5/9, or 55.56%, the meaning stays the same.
In everyday terms, 55.56% means a little more than half. You might see it in a survey result, a test score, or any situation where something is just over 50 % of the total.