A fraction is a number that names part of a whole or part of a group. The denominator represents the total number of equal parts the whole is divided into. A ratio is a comparison of two quantities.
For example, in a group of five students in which there are 4 boys and 1 girl, the fraction of the group that is female is
15. The fraction of the group that is male is 45 . The denominator will always be five because the whole group consists of five students.
the ratio of girls to boys is 14 and the ratio of boys to girls is 41 . The ratio of girls to students is 15, and the ratio of boys to students is 45.