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4. Using: 540 = 2² x 3³ × 5

a) Work out the highest common factor of 440 and 540
b) Work out the lowest common multiple of 440 and 540​

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Answer:

440 = 2 × 2 × 2 × 5 × 11 = 2³ × 5 × 11

540 = 2² × 3³ × 5

a) GCF = 2² × 5 = 20

b) LCM = 2³ × 3³ × 5 × 11 = 11,880

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