Lowest Common Multiples Prime Factors

Test yourself

LCM Using Prime Factors

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

Illustrative background for 2) Work out the multiplicationIllustrative background for 2) Work out the multiplication ?? "content

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.
Illustrative background for 3) Perform calculationIllustrative background for 3) Perform calculation ?? "content

3) Perform calculation

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

Jump to other topics


1.1Place Value

1.2Factors & Multiples


1.4Fractions, Decimals & Percentages

1.5Growth & Decay

1.6Measurements & Units



3Ratio, Proportion & Rates of Change

4Geometry & Measures



Go student ad image

Unlock your full potential with GoStudent tutoring

  • Affordable 1:1 tutoring from the comfort of your home

  • Tutors are matched to your specific learning needs

  • 30+ school subjects covered

Book a free trial lesson