Math 9 · Unit 1: Number and calculation · Cambridge Lower Secondary Maths Stage 9

Questions

1. 1. Write 2 600 000 in standard form.

   • 26 × 10⁵
   • 2.6 × 10⁷
   • 2.6 × 10⁵
   • 2.6 × 10⁶
   Check

2. 2. Write 920 000 000 in standard form.

   • 9.2 × 10⁷
   • 92 × 10⁷
   • 9.2 × 10⁹
   • 9.2 × 10⁸
   Check

3. 3. Write 462 000 in standard form.

   • 4.62 × 10⁵
   • 4.62 × 10⁴
   • 4.62 × 10⁶
   • 46.2 × 10⁴
   Check

4. 4. Write 20 800 000 in standard form.

   • 2.08 × 10⁶
   • 2.08 × 10⁷
   • 20.8 × 10⁶
   • 2.8 × 10⁷
   Check

5. 5. Write 55 000 in standard form.

   • 5.5 × 10⁵
   • 5.5 × 10⁴
   • 55 × 10³
   • 5.5 × 10³
   Check

6. 6. Write 55 million in standard form.

   • 5.5 × 10⁶
   • 55 × 10⁶
   • 5.5 × 10⁸
   • 5.5 × 10⁷
   Check

7. 7. Write 640 million in standard form.

   • 64 × 10⁷
   • 6.4 × 10⁶
   • 6.4 × 10⁸
   • 6.4 × 10⁷
   Check

8. 8. Write 406 million in standard form.

   • 4.06 × 10⁸
   • 4.6 × 10⁸
   • 406 × 10⁶
   • 4.06 × 10⁶
   Check

9. 9. Write 5.3 × 10⁴ in full.

   • 530 000
   • 5300
   • 5 300 000
   • 53 000
   Check

10. 10. Write 5.38 × 10⁷ in full.

    • 5 380 000 000
    • 538 000 000
    • 5 380 000
    • 53 800 000
    Check

11. 11. Write 7.11 × 10¹¹ in full.

    • 7 110 000 000 000
    • 711 000 000
    • 711 000 000 000
    • 71 100 000 000
    Check

12. 12. Write 1.331 × 10⁸ in full.

    • 133 100 000
    • 1 331 000 000
    • 1 331 000
    • 13 310 000
    Check

13. 13. One light year is 9 460 000 000 000 km. Write this in standard form.

    • 9.46 × 10¹² km
    • 9.46 × 10¹¹ km
    • 946 × 10¹⁰ km
    • 9.46 × 10¹³ km
    Check

14. 14. Write 0.000 03 in standard form.

    • 3 × 10⁻⁴
    • 3 × 10⁻⁵
    • 0.3 × 10⁻⁴
    • 3 × 10⁵
    Check

15. 15. Write 0.000 000 666 in standard form.

    • 6.66 × 10⁻⁶
    • 6.66 × 10⁷
    • 666 × 10⁻⁹
    • 6.66 × 10⁻⁷
    Check

16. 16. Write 0.000 0505 in standard form.

    • 5.05 × 10⁵
    • 5.05 × 10⁻⁵
    • 5.05 × 10⁻⁴
    • 5.5 × 10⁻⁵
    Check

17. 17. Write 0.000 000 000 48 in standard form.

    • 4.8 × 10⁻¹¹
    • 4.8 × 10⁻¹⁰
    • 48 × 10⁻¹¹
    • 4.8 × 10⁻⁹
    Check

18. 18. Write 1.5 × 10⁻³ in full.

    • 0.0015
    • 0.015
    • 1500
    • 0.00015
    Check

19. 19. Write 1.234 × 10⁻⁵ in full.

    • 0.000 123 4
    • 0.000 001 234
    • 123 400
    • 0.000 012 34
    Check

20. 20. Write 7.9 × 10⁻⁸ in full.

    • 0.000 000 079
    • 790 000 000
    • 0.000 000 007 9
    • 0.000 000 79
    Check