Fraction problems; Chapter V review

A common fraction is written a/b: b is the number of shares in the whole, a is the number of shares taken. When fractions with the same denominator are added or subtracted, the operation is done on the numerators only. The whole part is taken out of an improper fraction, and a mixed number is turned into an improper fraction. Mixed numbers are added and subtracted by whole and fractional parts; a whole is broken up if needed. The quotient of natural numbers is written as a fraction: a : b = a/b. Problems use the methods for a part of a number and for finding the whole from its part.