Prime numbers which are factors of 15: 3&5.
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1,3,5 and 15
LCMs and factors are two different things. You need at least two numbers to find an LCM. If that's 6 and 15, the LCM is 30. The factors of 6 are: 1, 2, 3, 6 The factors of 15 are: 1, 3, 5, 15 The factors of 615 are: 1, 3, 5, 15, 41, 123, 205, 615
To find the LCM of these numbers, you have to split them into their prime factors: 15 = 3x5 26 = 2x13 The next step would be to identify any common prime factors. However in this case there are none. Thus to find the LCM you just multiply the two numbers together: 15x26 = 390 And so the LCM of 15 and 26 is 390.
To find the factors of a number, you first need to split that number into its prime factors. In the case of 15, this produces: 15 = 3x5 The next step is to note that every factor of the number (apart from 1) is the product of any combination of its prime factors. Thus, the factors of 15 are: 1, 3, 5 and 15.
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