20/100 as a percentage is 20.00%. This means that out of every 100 parts, 20 parts are being considered, which is exactly one‑fifth of the whole.
The fraction 20/100 can be simplified to 1/5, but when we talk about it in everyday language, we often use the percent form because it’s easier to compare with other numbers that are already in percent.
Percentages like this are useful for describing things like discounts, test scores, or how much of a goal has been reached. Saying “20 % complete” is clearer than saying “one‑fifth complete.”
In most cases, writing the percentage with two decimal places—20.00%—keeps it consistent with other numbers that might need that level of precision.
