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What is the highest common multiple of 56 98 and 168?

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There is no highest common multiple of 56, 98 and 168. Their highest common factor, which you may have meant, is 14.
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What are the common multiples of 12 and 56?

The common multiplesof 12 and 56 are the multiples of their lowest common multiples, which is 168, namely: 168, 336, 504, 672, 840, 1008, 1176, 1344, 1512, 1680, 1848, 2016,

What is the greatest common factor of 56 and 98?

First find their prime factors: 56 = 2 x 2 x 2 x 7 = 4 x 14  14 = 2 x 7 x 7 = 14 x 7   2 x 7 is the greatest factor that is common to both numbers,  so the answer is 14.

What is the HCF of 56 98 168?

14

What is the least common multiple of 56?

There is no common multiple of a set with just one numeral. To find  a common multiple, you need at least two numbers. If that's 5 and  6, the LCM is 30.