To find the highest/greatest common factor. you must first identify the factors for each number.
For 120, its factors are 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, and 120.
For 36, its factors are 1, 2, 3, 4, 9, 12, 18, and 36.
12 is the highest (or greatest) factor they have in common, so the HCF for 120 and 36 is 12.
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