720, 900 and 1050 are three possible answers.
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You can find the prime factors of all three numbers, combine (multiply) those numbers and remove redundant factors. So if your numbers are 4, 6 and 8, then those factors are (2*2), (3*2), and (2*2*2) respectively. The GCF is 24 or (2*2*2*3). This is because 24 can be written as a multiple of all three numbers because 24 can be written as a multiple of 2 4 and 6. (2*2*3*(2)) (2*3*(4)) and (2*2*(6)). If this is still unclear you can check the Wikipedia Article on LCM.
Well, isn't that a happy little math problem! To find three numbers that multiply to 720, we can start by breaking down 720 into its prime factors: 2 x 2 x 2 x 3 x 3 x 5. Then, we can group these factors into three numbers, like this: 2 x 2 x 180, which equals 720. So, the three numbers are 2, 2, and 180.
The only two prime factors of 18 are: 2, 3
The prime factors of 18 are 2, 3, and 3. When multiplied together, 2 x 3 x 3 equals 18. These are the three prime numbers that multiply to give 18.
Any multiples of 30 have these three factors. Multiples of 30.