The factors of 5 are 1 and 5.
The factors of 10 are 1, 2, 5, and 10.
The factors of 20 are 1, 2, 4, 5, 10, and 20.
The common factors are 1 and 5. Therefore, the least (smallest) common factor is 1.
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The factors of 20 are 1, 2, 4, 5, 10, and 20. The factors of 50 are 1, 2, 5, 10, 25, and 50. The common factors of 20 and 50 are 1, 2, 5, and 10. Therefore, the least common factor (the smallest common factor) is 1.
The least common factor is 1. (The least common factor of any two or more positive integers is always 1.)
The Least Common Multiple (LCM) of 4, 10, and 20 is 20.
The greatest common factor (GCF) of 20 and 30 is 10.
The Greatest Common Factor of 20 and 90 is 10, because the factors of 20 are: 20:1,2,4,5,10,20 The factors of 90 are: 90:1,2,3,5,6,9,10,15,18,30,45,90 So, the common factors are 1,2,5,10 10 is the greatest number of them so 10 is the Greatest Common Factor. THE ANSWER IS 10