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Lowest Common Multiples Prime Factors

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LCM Using Prime Factors

We can use prime factors to help us find the lowest common multiple of two numbers.

2) Work out the multiplication

2) Work out the multiplication

  • To find the LCM, write down all the prime factors of 18 as a multiplication, then multiply by any prime factors of 24 that have not yet been included.
3) Perform calculation

3) Perform calculation

  • We can see that we still must multiply by two lots of 2.
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