1. Which of the following is an irrational number? (2 marks)
- 0.75
- √2
- −4
- 3/5
Edexcel IGCSEworksheeteasy
Number & Arithmetic Basics
Practice integers, factors, multiples, and order of operations — aligned to Edexcel IGCSE Number topics.
Mathematics · Number & Arithmetic · Year 10 · 25 mins · 20 marks · 10 questions
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Which of the following is an irrational number? (2 marks)
What is the highest common factor (HCF) of 36 and 48? (2 marks)
What is the lowest common multiple (LCM) of 8 and 12? (2 marks)
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2. What is the highest common factor (HCF) of 36 and 48? (2 marks)
- 6
- 8
- 12
- 18
3. What is the lowest common multiple (LCM) of 8 and 12? (2 marks)
- 16
- 24
- 36
- 48
4. Evaluate: 3 + 4 × (2² − 1). (2 marks)
5. Write 0.000045 in standard form. (2 marks)
6. A number is rounded to 2 significant figures as 3.6 × 10³. Which value could be the original number? (2 marks)
- 3540
- 3649
- 3550
- 3651
7. Find the reciprocal of 2/5. (2 marks)
8. Calculate 7² − 3³. (2 marks)
9. Which list contains only prime numbers? (2 marks)
- 2, 3, 9, 11
- 2, 5, 7, 11
- 1, 2, 3, 5
- 4, 5, 7, 13
10. Simplify: (−3) × (−4) − 10. (2 marks)
Show answer key
- 1. √2
- 2. 12
- 3. 24
- 4. 15
- 5. 4.5 × 10⁻⁵
- 6. 3649
- 7. 5/2
- 8. 22
- 9. 2, 5, 7, 11
- 10. 2
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