0580/23 Oct/Nov 2025, Question 2: Factors and Multiples
Cambridge IGCSE Mathematics 0580 · Paper 23 (Extended) · Non-calculator · 1 mark
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The question, in short
Find the largest odd number that divides both 90 and 120.
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Solution · 1 mark
- 190 = 2 × 3² × 5 and 120 = 2³ × 3 × 5; HCF = 2 × 3 × 5 = 30
- 2Odd factors of 30: 1, 3, 5, 15; largest = 15
Answer15
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