Pearson Edexcel International GCSE (9–1) · MATHEMATICS A · Chapter
Number 2
18 practice questions
Practice questions
1–8 of 8 · Normal
Question 1
1 mark · Normal
Answer and see the solution →Write 5 600 000 in standard form.
Question 2
1 mark · Normal
Answer and see the solution →Write 0.00047 in standard form.
Question 3
2 marks · Normal
Answer and see the solution →Calculate (3 × 10^4) × (2 × 10^2) and write your answer in standard form.
Question 4
3 marks · Normal
Answer and see the solution →Calculate (7.2 × 10^{-3}) ÷ (1.8 × 10^{2}) and give your answer in standard form.
Question 5
3 marks · Normal
Answer and see the solution →Copy and complete the table by writing each number in standard form.
Decimal Number Standard Form 720 000 0.082 6 301 000 Question 6
4 marks · Normal
Answer and see the solution →A scientific magazine gives the following information:
Diameter of objects Object Diameter (m) Dust particle 0.000 0031 Red blood cell 0.000 0072 Water molecule 0.000 000 27 (a)[1 mark]Write the diameter of the red blood cell in standard form.
(b)[1 mark]Express the diameter of the water molecule as an ordinary number.
(c)[2 marks]Calculate how many dust particles, placed end to end, would fit across the diameter of a red blood cell. Give your answer to 2 significant figures.
Question 7
2 marks · Normal
Answer and see the solution →Work out 10^{-2} × 10^7 and write your answer as a decimal.
Question 8
4 marks · Normal
Answer and see the solution →An engineer records the following readings for three components in a circuit:
Component Measurement A 4.5 × 10^{-2} B 7.3 × 10^{-1} C 2.8 × 10^1 (a)[1 mark]Write the value of component B as an ordinary number.
(b)[1 mark]Write the value of component C in standard form to 1 decimal place.
(c)[2 marks]Calculate the product of component A and component C. Write your answer in standard form.