the gcf of 20 and 70

Answer 1

Greatest common factor is greatest number that divides both the numbers without a remainder.

Find the prime factors of each number

20 = 1 * 2 * 2 * 5

70 = 1 * 2 * 5 * 7

The common factors are 1, 2, and 5.

The greatest common factor = 1 * 2 * 5 = 10.

Answer 2

The GCF is the product of the common prime factors in each number.

Factor each monomial and Circle the common prime factors.

The product of common prime factors, 2 • 5 or 10 is called the greatest common factor of 20 and 70.