To find the lowest common multiple you must have at least two numbers.
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All factors of 25 and 4 are lowest common multiples of some numbers. Factors of 25: 1, 5, 25 Factors of 4: 1, 2, 4 eg 25 is lcm of 5 and 25. The only (and thus) lowest common factor of 25 and 4 is 1. Thus the lowest common multiple of 25 and 4 is 100.
There is an infinite number of common multiples for 15 and 25. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder). However, the least or lowest common multiple (LCM) of 15 and 25 is 75.
The Greatest Common Factor between 72 & 300 is 12, so (72/12) / (300/12) = 6/25
50 is one.
150 is the least common multiple