30/150 = 20%
A value like 30/150, or 20%, can show up in everyday life as a discount, test score, or survey result. For example, 20% of the students in a class might ride the bus to school, or a store might take 20% off the price of an item.
To picture 20% quickly, imagine 20 out of every 100 things, or about one-fifth of a group. It is less than one-quarter, so in a group of 150, you could estimate it as a fairly small section—about two parts out of ten.
A common mistake is thinking 30/150 represents 30%, because people may focus on the numerator and ignore the total. The denominator, 150, tells you the whole group, so the fraction describes 30 items out of all 150 items.
