Pearson Edexcel International GCSE (9–1) · MATHEMATICS A · Chapter
Number 2
18 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
5 marks · Hard
Answer and see the solution →The distance from the Earth to Star X is 2.46 × 10^{12} km. The distance from the Earth to Star Y is 7.82 × 10^{13} km.
(a)[3 marks]Calculate how many times farther Star Y is from Earth compared to Star X. Give your answer in standard form.
(b)[2 marks]If a spaceship travels at 2.05 × 10^{5} km per hour, estimate how many hours it would take to reach Star X from Earth. Give your answer in standard form.
Question 2
4 marks · Hard
Answer and see the solution →Evaluate (4.8 \times 10^{-3}) \times (6.2 \times 10^{5}) and give your answer in standard form.
Question 3
6 marks · Hard
Answer and see the solution →A laboratory measures the masses of three specimens. Their masses are given below:
Specimen Mass (g) A 0.00741 B 0.0741 C 0.00417 (a)[3 marks]Write the mass of each specimen in standard form.
(b)[1 mark]Arrange the specimens in order of increasing mass.
(c)[2 marks]Calculate the difference in mass between specimen B and specimen C. Give your answer in standard form.