1, 2, 4, 8
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8 and 5 share no common factors aside from 1.
The factors of 8 are: 1, 2, 4, 8 The factors of 10 are: 1, 2, 5, 10
The factors of 4 are: 1, 2, and 4.The only prime factor of 4 is: 2.The factors of 40 are: 1, 2, 4, 5, 8, 10, 20, and 40.The prime factors of 40 are: 2 and 5.
I could tell you what all the factors of each of those 4 numbers are, but I am guessing you are asking for the common factors. Lets start with the prime factorization of each number: 10 is 2 * 5 8 is 23 12 is 22 * 3 15 is 3 * 5 So no prime factor is common to all 4 numbers. The only common factor is 1.
Factors of 40: 1, 2, 4, 5, 8, 10, 20, 40. Factors of 85: 1, 5, 17, 85.