1, 2, 5 and 10.
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5, 10, and 20 are all multiples of 5 and factors of 20.
The factors of 20 are: 1, 2, 4, 5, 10, 20 The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30 The factors of 80 are: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80
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 20 are 1, 2, 4, 5, 10 and 20. The factors of 30 are 1, 2, 3, 5, 6, 10, 15 and 30. Therefore their common factors are 1, 2, 5 and 10.
Since 10 is a factor of 20, all of its factors are common.