The worksheets are given here to practice GCF of two numbers. It is otherwise known as the Highest Common factor. Two numbers have been given. You need to find the factors for each one of them and compare those factors to find the final answer that is common and highest from both the factors. Also, check the GCF of the three numbers. Two lines are given followed by numbers to write the factors separately and the last small line given to write the final highest factor.