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it is 7

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Q: What is the highest common factor of 28 and 21?
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What is the highest common factor of 28 14 and 21?

The GCF is 7.


What is the highest common factor of 28 and 7791?

The highest common factor is 7.


What is the HCM of 21 and 28?

The common multiples of 21 and 28 are 84, 168, 252, 336, ... and so on, never ending; so there is no real Highest Common Multiple.Do you mean:Highest Common Factor - the highest number which divides both 21 and 28 which is 7; orLowest Common Multiple - the lowest number which is a multiple of both 21 and 28 which is 84.


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The highest common factor of the numbers 28, 84 and 91 is 7.


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The Greatest Common Factor (GCF) is: 28


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What is the lowest common factor of 28 and 32?

1 and the highest common factor is 4