If you convert 18/69 to a percentage, you get 26.09% (rounded to two decimal places). This tells you how much of a whole 18 is when the whole is split into 69 equal parts.
The fraction 18/69 can be reduced to 6/23, which still represents the same value. Thinking of it as a part of a whole makes it easy to compare with other numbers, especially when percentages are involved.
Knowing that 18 out of 69 is about a quarter (a little more than 25%) is useful in everyday situations, like figuring out a discount, a test score, or a portion of a group. The percentage form lets you communicate the idea quickly and clearly.
