4MA1/1F Jun 2024, Question 18: HCF and LCM
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1F (Foundation) · Calculator · 2 marks
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The question, in short
Find the highest common factor of 72 and 108, showing working clearly.
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Solution · 2 marks
- 172 = 2 × 2 × 2 × 3 × 3
- 2108 = 2 × 2 × 3 × 3 × 3
- 3common prime factors: 2 × 2 × 3 × 3
- 42 × 2 × 3 × 3 = 36
Answer36
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