1 and 5
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The common factors of 20, 25, and 40 are 1 and 5.
Factors of 20: 1, 2, 4, 5, 10, 20Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30Factors of 80: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80Common factors of 20, 30, and 80: 1, 2, 5, 10
The factors of 100 are 1, 2, 4, 5, 10, 20, 25, 50 and 100. For them to be common, they need to be compared to another set of factors.
1 and 5, the GCF.
The common factors of 25 and 50 are 1, 5 and 25.All of them.