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1, and only 1. There are no common factors (whole numbers) between those three numbers but one.
If there is no common factor greater than 1, then the lcm of those numbers is the product of those numbers. eg hcf(5, 7) = 1 → lcm(5, 7) = 5 x 7 = 35 eg hcf(4, 9) = 1 → lcm(4, 9) = 4 x 9 = 36
If the two numbers do not have any factors in common (other than 1), then the LCM is the same as the product of the two numbers. Example: LCM of 5 & 6 is 30, which is the same as the product.
The answer is 5 & 25, if you do not include 1 (because its not supposed to be)
We use the LCM to compare whole numbers. What you do with the numbers after that is your business. 1 yard is 3 feet. The LCM of 2 and 3 is 6.