4MA1/2H Jan 2022, Question 7: HCF and LCM
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2H (Higher) · Calculator · 3 marks
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The question, in short
Find the lowest common multiple of 28, 42 and 63, showing your working clearly.
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Solution · 3 marks
- 128 = 2 × 2 × 7
- 242 = 2 × 3 × 7
- 363 = 3 × 3 × 7
- 4LCM = 2² × 3² × 7
- 54 × 9 × 7 = 36 × 7
- 636 × 7 = 252
Answer252
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