1, 2, 5, 10
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Factors of 30 are: 1, 2, 3, 5, 6, 10, 15, and 30. Factors of 40 are: 1, 2, 4, 5, 8, 10, 20, and 40. Find the greatest factor they both have in common. That is the greatest common factor.
Least Common Multiple (LCM) for 20 30 40 is 120
The Least Common Multiple (LCM) for 30 20 40 is 120.
Any number between 30 and 40 can be a factor. The common factors of 30 and 40 are 1, 2, 5 and 10.
The common factors of 40 and 360 are 1, 2, 4, 5, 8, 10, 20 and 40.