42/52 is 80.77% when you turn the fraction into a percentage. This rounded figure gives a quick sense of how large the part is compared to a whole.
The fraction 42/52 can be simplified to 21/26, but the percentage stays the same. Knowing the percent helps when you need to compare it to other numbers that are already in percent form.
In everyday situations, saying something is about 81 % of a whole is easier to understand than a fraction. It tells you that the part is just a little short of the full amount.
Remember, the rounded 80.77% is accurate to two decimal places, which is usually precise enough for most practical uses.
