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28

1*28 = 28

4*7 = 28

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16y ago

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Least common multiple of 4 and 7?

28


What is the Least common multiple for 7 and 28?

The LCM is: 28


What is the LCM of 28 and 21?

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