Since 40 is a factor of 120, all of its factors are common.
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120 is the LCM of 30 and 40
LCD(3, 40) = 120
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
The Greatest Common Factor of 36 and 120 (GCF) is: 12