0580/12 Feb/Mar 2021, Question 15: HCF and LCM
Cambridge IGCSE Mathematics 0580 · Paper 12 (Core) · Calculator · 2 marks
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The question, in short
Find the lowest common multiple of 18 and 21.
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Solution · 2 marks
- 118 = 2 × 3 × 3
- 221 = 3 × 7
- 3LCM = 2 × 3 × 3 × 7 = 126
Answer126
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