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Both 4 and 15 go into their least common multiple (LCM), which is 60. This means that any multiple of 60 can be evenly divided by both 4 and 15. Additionally, both numbers are factors of 60, making it a common multiple.
Both 15 and 20 can go into 60, as they are both factors of that number.
3 will go into both of these numbers
1 and 3 go into both.
The factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60.