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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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Q: What is the least common multiple of the numbers 5 7 and 9?
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