The lowest common multiple is 90 .
There is no highest one. If you think you've found the highest one,
just add 90 to it, and you'll have a higher common multiple. You can
continue doing that forever.
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The least common multiple of the numbers 30, 70 and 45 is 630.
The least common multiple of the numbers 18, 30 and 45 is 90.
The least common multiple of 8, 30 and 45 is 360.
The factorization of 15 is 3 x 5. The factorization of 36 is 22 x 32. The factorization of 75 is 3 x 52. The least common multiple is the product of the highest powers of each number: 22 x 32 x 52 = 900
The LCM of 16 and 45 is 720, their product.