1 and 5
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The common factors are: 1, 2, 5, 10
the factors of 5 are 1 and 5the factors of 20 are 1 2 4 5 10 20the factors of 45 are 1 3 5 9 15 45so the common factors are 1 and 5
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.
The common factors of 40 and 70 are 1, 2, 5, 10
The common factors of 10 and 15 are: 1 and 5.