Question

What is the highest common factor of 21 and 42?

Answer 1

Answer:

Factors of 42 are 1, 2, 3, 6, 7, 14, 21 and 42. So the highest common factor of these three numbers is 3.

Answer 2

$\color{red}{QUESTION}$

What is the highest common factor of 21 and 42?

$\color{blue}{ANSWER}$

Factors of 42 are 1, 2, 3, 6, 7, 14, 21 and 42. So the highest common factor of these three numbers is 3.