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Find LCM from factored numbers

Find lowest common multiple from factored numbers

This math skill teaches how to find the lowest common multiple (LCM) of two numbers using their prime factors. Identify all distinct prime factors, counting shared factors only once, and multiply them to find the LCM.

Learn find LCM from factored numbers

Teaching Transcript

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Let's find the lowest common multiple of 8 and 12. We already have their prime factors here

Find the set of all distinct factors. Shared factors are only counted once. That becomes 2, 2, 2, and 3

Multiplying this set of distinct factors together we get a lowest common multiple of 24

Skill Practice

Find lowest common multiple from factored numbers

Test your understanding of find LCM from factored numbers by practicing it! Work through the below exercises to use it in practice.