90/450 = 20%
A fraction like 90/450 can show up when 90 people out of a group of 450 choose the same option in a survey. It represents 20%, which could also describe a sale discount, a classroom attendance rate, or the portion of a budget spent on one category.
To picture 20% quickly, imagine dividing a whole into five equal parts and shading one of them. It is also close to one-fifth, so you can estimate it as a fairly small but noticeable portion.
A common mistake is thinking that 90/450 is 90%, because people sometimes focus on the numerator and overlook the total amount. The denominator, 450, represents the entire group, so the fraction compares 90 with all 450 items.
