**Answer:**

60

**Step-by-step explanation:**

Find the prime factorization of 60

60 = 2 × 2 × 3 × 5

Find the prime factorization of 180

180 = 2 × 2 × 3 × 3 × 5

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

Therefore, GCF = 2 × 2 × 3 × 5

GCF = 60