The fraction 21/55 is equal to 38.18% when converted to a percentage and rounded to two decimal places. This means that if you had 55 items and selected 21 of them, you'd have chosen about 38% of the total. It's a bit more than one-third but less than two-fifths of the whole.
In everyday situations, you might come across this fraction or percentage in various contexts. For example, if 21 out of 55 students in a class passed a test, you could say that 38.18% of the class succeeded. Or if a store sold 21 items out of their 55-item inventory, they would have sold approximately 38% of their stock. This fraction and its percentage equivalent can be useful for quick mental math and estimations in daily life.