Question: What is the highest common factor of 20 and 5?
(1) 4
(2) 2
(3) 10
(4) 5
Solution :
REMEMBER : The highest common factor is the largest whole number that is a factor of each of two or more numbers.
List the factors of each number. Find the largest number that appears in both lists.
Factors of 20: 20, 10, 5, 4, 2, 1
Factors of 5: 5, 1
The highest common factor of 20 and 5 is 5.
Then the option is (4).
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