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There is no highest common multiple. Once you get a common multiple - for example, multiplying 18 x 57, or using prime factorization to get the smallest common multiple - you can multiply it by 2, by 3, by 4, etc. and get ever-larger common multiples.

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12y ago
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7y ago

The highest common denominator of any set of denominators is infinite.

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11y ago

The greatest common denominator is infinite. The LCM is 36.

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8y ago

The GCF is 2.

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Q: What is the highest common denominator of 18?
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