1 and 5
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1 and 2 are the common factors of 8 and 10.
2 and 5 are the prime factors that are common to all multiples of 10.
1,11,12,13,14,15,16,17,18,19,2,6,7,8,9,3,4,5, those r some of the factors between 10 and 20
The common factors of 10 and 30 are: 1, 2, 5, and 10 Btw, this exact answer was the first response to a google search of "common factors".
The factors of 10 are 1, 2, 5 and 10. For them to be common, they need to be compared to another set of factors.