The document explains how to add fractions by finding a common denominator. It gives examples of adding fractions like 1/2 + 1/2, 1/4 + 3/4, and 1/5 + 2/5. To add fractions with different denominators, the document instructs readers to find the least common multiple of the denominators to use as the common denominator. More practice problems are provided with steps shown to find the sums.