Exercise 106 Page 49

When adding or subtracting fractions, they should have the same denominator. In this exercise, we have two fractions with different denominators. Notice that $20$ is the least common multiple of $5$ and $64.$ In this case, we can multiply both the numerator and denominator of $\frac{4}{5}$ by $4$ to create an equivalent fraction with a common denominator.

When adding or subtracting fractions, they should have the same denominator. In this exercise, we have two fractions with different denominators. Notice that $35$ is the least common multiple of $7$ and $5.$ In this case, we can multiply both the numerator and denominator of $\frac{6}{7}$ by $5$ to create an equivalent fraction with a common denominator.