4/40 = 10%
A fraction like 4/40, or 10%, can show up in everyday life when 4 out of 40 people choose a certain option. For example, it could describe the share of students in a club who ride the bus to school.
To picture 10% quickly, think of one part out of ten equal parts, or about a small slice of a whole group. In a group of 40, 4 items would look like a noticeable but fairly small section.
A common mistake is thinking 4/40 is 4%, because the numerator is 4. The denominator matters too, since it tells you the total number of items in the group.