What is the LCM of 28 and 21?

Anonymous

∙ 16y ago

Updated: 8/17/2019

To determine the least common multiple of two numbers, determine the prime factors of both number. Then, determine the prime factors they have in common. Multiply all their prime factors together (in other words, multiply both numbers together) and divide by the prime factors they have in common (in other words, their greatest common factor).

The prime factors of 21 are 3 and 7.

The prime factors of 28 are 2, 2, and 7.

The prime factors in common are a single 7.

Therefore, the lowest common multiple is 21 x 28 ÷ 7 = 84

Wiki User

∙ 13y ago

What else can I help you with?

What is the LCM of 21 28 and 42?

LCM(21, 28, 42) = 84

What is the LCM of 21 14 and 28?

The LCM is: 84

What is the LCM for 6 21 and 28?

LCM(6, 21, 28) = 84.

What is the LCM of 28 what is the LCM of 21 what is the LCM of 9?

Of each of them on their own respectively is 28, 21 and 9. together is 252

What is the LCM of 273 21 and 28?

The Least Common Multiple (LCM) for 273 21 28 is 1,092.

What is the LCM of 18 and 21 and 28?

The LCM is: 252

What is the LCM of 21 28 and 32?

The LCM is: 672

What is the LCM 21 28 32?

The LCM is: 672

What is the LCM of 35 21 and 28?

The Least Common Multiple (LCM) of 35, 21, and 28 is 420.

What is the LCM of 12 21 and 28?

LCM of 12 and 21 is 84, which is also a multiple of 28 so 84 is your answer.

What is The least common multiple of 21 35 and 28?

The LCM of 2135 and 28 is 8540 The LCM of 21, 35 and 28 is 420.

What is the LCM 21 and 28?

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