Find the GCF of 21, 30

Question

asked Jan 12, 2021 11.3k views

2 Answers

Mark White · Answer 1 · 2021-01-13T16:01:56+0000

Answer:

3

Explanation:

Factors of 21: 1, 3, 7, 21

Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30

The GCF is the largest factor they both have.

GCF = 3

Ferares · Answer 2 · 2021-01-18T08:00:02+0000

Answer:

The GCF of 21 and 30 is 3.

Explanation:

Find the prime factorization of 21

21 = 3 × 7

Find the prime factorization of 30

30 = 2 × 3 × 5

To find the gcf, multiply all the prime factors common to both numbers:

Therefore, GCF = 3