What are the LCM 21 and 28?

Answer 1

The factors of 21 are: 1, 3, 7, and 21.
The prime factors of 21 are: 3 and 7.

The factors of 28 are: 1, 2, 4, 7, 14, and 28.
The prime factors of 28 are: 2 and 7.
21- 1,3,7, and 21

28- 1,2,4,7,14, and 28

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Answer 2

3 x 7 = 21
2 x 2 x 7 = 28
Combine the factors, eliminating duplicates.
2 x 2 x 3 x 7 = 84, the LCM

Answer 3

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

Answer 4

It is: 168

Answer 5

It is: 420