To find the prime factors of a number, it is easiest to divide that number by any obvious factors. In this case, 28 is even so we can divide by 2 to give 14. 14 is also even, so we
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The factors for 28 are 1,2,4,7,14 and 28. For 180 are 1, 2, 3, 4, 5, 6, 9,10, 12,
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1, 2, 4, 7, 28 and 14 are all factors of
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87 = (1, 3, 29, 87). 54 = (1, 2, 3, 6, 9, 18, 27, 54). 28 = (1, 2, 4, 7, 14, 28).
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