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What is the highest common factor of 4 and 8?

Question: What is the highest common factor of 4 and 8?
(1) 2
(2) 4
(3) 3
(4) 1

Solution:

Write the prime factorisation for each number.
4 = 2 * 2
8 = 2 * 2 * 2
Next, find the common factors shared by both of the numbers.
4 = 2 * 2
8 = 2 * 2 * 2
Finally, multiply the common factors to find the highest common factor.
2 * 2 = 4
The highest common factor of 4 and 8 is 4.
Then the option is (2) 4

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