User: what is the least common multiple of 30 and 42

User: define the least common multiple

User: what is the least common multiple of 30 and 42 and why?

Weegy: what is the least common multiple of 30 and 42 and why?
Answer:
The least common multiple is 210.
The prime factors of 30 are 2, 3, and 5.
The prime factors of 42 are 2, 3, [ and 7.
The prime factors in common are 2 and 3.
The least common multiple is (2 x 3 x 5) x (2 x 3 x 7) / (2 x 3) = 210.
By representing it as a calculation with prime factors, you can cancel out the divisors, so you have as your reduced calculation 5 x 2 x 3 x 7 rather than 30 x 42 ÷ 6.
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Weegy: Begin the list with 1, leave some space for other numbers, and end the list with the number itself.
Test whether 2 is a factor — that is, see whether the number is divisible by 2.
If it is, add 2 to the list, [ along with the original number divided by 2 as the second-to-last number on the list.
Test the number 3 in the same way.
Continue testing numbers until the beginning of the list meets the end of the list. ] (More)

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