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Factoring each number into product of primes:
5=1 x 5
7 = 1 x 7
9 = 3 x 3, 1 x 9
The number 5 is a factor of 5 only; Include 5 in answer
The number 7 is a factor of 7 only; Include 7 in answer
The number 3 is a factor twice of 9; Include 3x3 in answer
Therefore,
LCM(5,7,9) = 3 x 3 x 5 x 7 = 315
Additional content regarding LCM may be referenced at
http://www.math.info/Arithmetic/LCM
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What is least common multiple of 2 5 and 15?
The least common multiple of the numbers 2, 5 and 15 is 30.
What is the least common multiple of 5 and 23?
The least common multiple of two numbers is the product of the two numbers divided by their greatest common factor. The greatest common factor of 5 and 23 is 1. (See related question "What is the greatest common factor of 5 and 23?" for this calculation.) So, the least common multiple is 5 x 23 ÷ 1 = 115.
What is the least common multiple of 5 and 31?
Well, honey, the least common multiple of 5 and 31 is simply the product of the two numbers since they are already prime and don't share any common factors. So, the least common multiple of 5 and 31 is 155. Easy peasy lemon squeezy!
What is the least common multiple of 3 2 and 5?
The least common multiple of 3 , 2 , 5 = 30
What is the least common multiple of 2 5 9?
The least common multiple of 2 , 5 , 9 = 90
