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Did you mean highest common factor? Or perhaps lowest common multiple? Because asking for the highest common multiple would be impossible to answer as the number would go further than the billions and quadrillions and centillions!

As an example: 28,000,000,000,000,000,000,000,000,000,000,000 is a multiple of both 35 and 40. You can keep adding zeroes on the end and the number will still be multiples of both numbers.

That's why there is confusion about what you're asking. The answer would be undefined since it would have too many zeroes to fit in this text box..

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12y ago
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10y ago

It is infinity but the lowest common multiple is 280

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Q: What is the highest common multiple of 35 and 40?
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