30/75 = 40%
A value like 30/75, or 40%, can show up in everyday situations such as a sale, a survey, or a class where 40 out of every 100 students choose a certain option. It could also describe progress, like finishing 40% of a project or filling a container to about two-fifths of its capacity.
To picture 40% quickly, imagine a group divided into five equal parts and shade two of them. It is a little less than half, so you can estimate it as close to 50% without treating it as exactly half.
A common mistake is thinking that 30/75 is closer to 30% because the numerator is 30. The denominator represents the whole amount, so the fraction describes 30 parts out of 75, not 30 parts out of 100.