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The least common multiple (LCM) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question! The least multiple of a number is itself.
The multiples of 75: 75, 150, 225, 300, 375, 450, 525, 600, 675, 750, 825, ... The multiples of 250: 250, 500, 750, 1000, ... The least common multiple is the number in both lists that is the least. For 75 and 250, the least common multiple is 750.
No, 3 is a factor of 75. 75 is a multiple of 3.
If the last two digits of a number are a multiple of 25 - i.e., 00, 25, 50, or 75 - then the number is divisible by 25. This is related to the fact that 100 is a multiple of 25.
The Least Common Multiple (LCM) for 25 and 15 is the smallest multiple that both numbers share. To find the LCM, you can start by listing the multiples of each number: 25 (25, 50, 75, 100, 125, 150, ...) and 15 (15, 30, 45, 60, 75, 90, ...). The smallest multiple that appears in both lists is 75, so the LCM for 25 and 15 is 75.