Best Answer

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; or
- Lowest Common Multiple - the lowest number which is a multiple of both 21 and 28 which is 84.

Q: What is the HCM of 21 and 28?

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Hcm of 50 and 60= 2

This question as written has no rational answer since the value of an hcm, being infinite, is unquantifiable. If you change the hcm to GCF, you could use 6 and 8 or 24 and 2.

21/28 = 3/4

1.3333

21/28 = 3/4 or 0.75

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Hcm of 50 and 60= 2

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The highest common multiple is an infinite number and a bit impractical. In this case, the GCF is 7 and the LCM is 147.

The GCF is 19. The LCM is 228. The HCM is infinite.

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28 times 21 equals 588.

It is: 28-21 = 7

21 out of 28 = 75%

This question as written has no rational answer since the value of an hcm, being infinite, is unquantifiable. If you change the hcm to GCF, you could use 6 and 8 or 24 and 2.

There is no such thing as a Highest Common Multiple (HCM), for it always equals to infinity, since multiples always stretch forever.For example, the HCM of 4 and 7.Multiples of 4: 4, 8, 12, 16, 20, 24, 28, ... infinityMultiples of 7: 7, 14, 21, 28, 35, 42, 49, ...infinityAccording to the working, the highest common factor of any number will always be infinity.Very little in a practical sense. The highest common multiple of any set of numbers is an infinite amount.The highest common multiple is an infinite number and has very little practical use.