The fraction 21/52 is equal to 40.38% when converted to a percentage and rounded to two decimal places. This means that 21 out of 52 parts represents about 40% of the whole. It's a bit less than half, but more than a third of the total.
In everyday situations, you might come across this fraction or percentage in various contexts. For example, if 21 out of 52 weeks in a year have rainy weather, you could say that it rains about 40% of the time. Or if 21 out of 52 students in a class wear glasses, you could say that roughly 40% of the class needs vision correction.