0580/13 Oct/Nov 2025, Question 6: Integers
Cambridge IGCSE Mathematics 0580 · Paper 13 (Core) · Non-calculator · 2 marks
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The question, in short
Anna multiplies a number by 2, then takes the square root, getting 12. Find the number she started with.
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Solution · 2 marks
- 1Work backwards: square 12, then divide by 2
- 212² = 144
- 3144 ÷ 2 = 72
Answer72
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