The factors of 40 are: 1, 2, 4, 5, 8, 10, 20, 40
The factors of 144 are: 1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, 144
The common factors are: 1, 2, 4, 8
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The factors of 40 are 1,2,4,5,8,10,20 and 40. For them to be common, they need to be compared to another set of factors.
The common factors of 30 and 40 are 1, 2, 5, 10
Since 40 is a factor of 120, all of its factors are common.
The Greatest Common Factor (GCF) is: 36
40 and 21 have no common prime factors