21/50 = 42%
A value like 21/50, or 42%, can show up in everyday situations such as a survey where 21 out of 50 people choose the same answer. It could also describe a test score, a discount, or the portion of a class that participates in an activity.
To picture 42%, imagine 50 equal spaces with 21 of them shaded, or think of a little less than half of a whole. Since half of 50 is 25, 21 out of 50 is four spaces short of halfway.
A common mistake is thinking that 42% means 42 out of every 50, when percent values are normally described as parts out of 100. It is also easy to assume 42% is close to 50%, even though it is noticeably below half.