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# What is the highest common multiple of 21 and 84?

Updated: 12/22/2022

Wiki User

14y ago

The highest common multiple of 21 and 84 is infinity.

The least common multiple, on the other hand, is 84, while the greatest common divisor is 21.

Wiki User

14y ago

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Q: What is the highest common multiple of 21 and 84?
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### What is the highest common multiple of 12and 21?

The highest common multiple is infinite, and not very practical. The GCF is 3. The LCM is 84.

### What are the greatest common factor and least common multiple of 21 and 84?

The GCF of 21 and 84 is 21, since it is a factor of 84. The LCM of 21 and 84 is 84, since it is a multiple of 21.

### 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.

### What is least common multiple of 21 84 126?

The least common multiple of 21 , 84 , 126 = 252

### What are the least common multiple of 21 28 42?

Least Common Multiple is 84

### What is the least common multiple of 84 and 21?

The least common multiple (LCM) is often also called the lowest common multiple or smallest common multiple. Keep in mind that these different terms all refer to the same thing: the smallest positive integer which is a multiple of two or more numbers.The least common multiple of 21 and 84 is 84.

### What is the least common multiple of 28 7 and 21?

The Least Common Multiple (LCM) for 21 28 7 is 84.

LCM(4, 21) = 84

The LCM is 84.

### What is the least common multiple of 4 6 and 21?

The Least Common Multiple (LCM) of (4,6,21) is 84.

### What is the common multiple of 12 and 21?

Any multiple of 84.

84