The least common multiple (LCM) is often also called the lowest common multiple or smallest common multiple. Keep in mind that these different terms all refer to the same thing: the smallest positive integer which is a multiple of two or more numbers.
The least common multiple of 75 and 225 is 225.
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The Least Common Multiple (LCM) for 45 25 is 225.
The LCM is: 225225
The least common multiple of 42 and 25 is 1050.
7 is prime, so it's lowest common multiple with anything that isn't itself a multiple of 7 (in which case the LCM would just be the other number itself) is that number times seven (in this case, 175).
The Least Common Multiple (LCM) of (9, 25 and 120) is 1,800.