Maths unit A:HCF and LCM 0.0 / 5 ? MathematicsNumberGCSEAll boards Created by: rvsnCreated on: 16-11-14 17:14 Write 12 and 18 as product of prime factors 12=2x2x3, 18=2x3x3 1 of 5 What technique is the first step before you wok out the HCF or LCM create a venn diagram and fill it in with the prime numbers of both numbers 2 of 5 How do you work out the HCF? multiply all the common prime numbers 3 of 5 How do you work out the LCM? Multiply all the numbers left together in the diagram after the common ones have been put in the middle 4 of 5 Work out the HCF and LCM of 12 and 18 HCF=6, LCM=36 5 of 5
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