## Algebra: A Combined Approach (4th Edition)

$\frac{4}{7}$
1. Write numerator and denominator as product of primes: $\frac{20}{35}$ = $\frac{2 * 2 * 5}{5 * 7}$ 2. Separate common factors out by writing as a fraction equal to 1: $\frac{2 * 2}{7}$ * $\frac{5}{5}$ = $\frac{2 * 2}{7}$ = $\frac{4}{7}$