Answer:
The highest number that divides each of the two or more numbers is the HCF or Highest Common Factor.
Explanation:
Example: What is the HCF of {12,42,14}
Answer: The HCF is 2 as the biggest number they can all be divided by is 2. {12,42,14} = {2^2*3,2*3*7,2*7} The factors in each number is 2.