HCF and LCM (Edexcel GCSE Maths): Flashcards

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HCF and LCM
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Definition of HCF

Largest number dividing exactly into 2+ numbers

Definition of LCM

Smallest number that is a multiple of 2+ numbers

108108 as product of prime factors

22×332^2 \times 3^3

240240 as product of prime factors

24×3×52^4 \times 3 \times 5

HCF from Venn diagram uses which factors?

Common factors (intersection)

LCM from Venn diagram uses which factors?

All factors from entire diagram

For HCF, which power of common primes?

Lowest power

For LCM, which power of primes?

Highest power that appears

Operator to use for prime factors in exams

×\times signs (never + signs)

Notation style for powers in final answers

Index notation (e.g., 222^2)

HCF size compared to original numbers

Smaller than both

LCM size compared to original numbers

Larger than both

HCF of 108108 and 240240

1212

LCM of 108108 and 240240

21602160

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