Question

Find the LCM of the following numbers by prime factorisation method.
48, 56 and 72

Answer 1

$2|48,56,72$

_______________

$2|24,28,36$

_______________

$2|12,14,18$

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$2|6,7,9$

_______________

$3|3,7,9$

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$3|1,7,3$

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$7|1,7,1$

_______________

$|1,1,1$

LCM

$=2\times 2\times 2\times 2\times 3\times 3\times 7$

$=1008$.