Question

Find the LCM of the following numbers by the common division method: (a)175,168,350​

Answer 1

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4200

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• To find LCM, first divide all the three numbers with the lowest common factor, which is a whole number.

Write your numbers in the top row.

Divide your numbers by prime numbers as long as at least one of your numbers is evenly divisible by a prime number.

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Bring down any numbers that are not evenly divisible by the prime number.

When the last row of results is all 1's you are done.

Find the product of the prime numbers in the first column to get the LCM:

LCM = 2 x 2 x 2 x 3 x 5 x 5 x 7

LCM = 4200

Therefore,

LCM(168, 175, 350) = 4200

Answer 2

4200

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