Explanation

To find the Highest Common Factor (HCF) of 12, 18, and 30, we follow these steps:

Find the prime factors:

12 = 2 × 2 × 3

18 = 2 × 3 × 3

30 = 2 × 3 × 5

Identify common factors:

Common prime factors: 2 and 3

Multiply them: 2 × 3 = 6