Math 7 · Unit 3: Place value and rounding · Cambridge Lower Secondary Maths Stage 7

Questions

1. 1. Question 1: each oval card has the same value as a square card. Match each number to its power of 10.

   • 1000
   • 100
   • 100 000
   • 10 000 000
   • 10 000

   • 10³
   • 10⁴
   • 10⁷
   • 10⁵
   • 10²
   Check

2. 2. Question 2a: complete 6 × 10⁴ = 6 × ☐ = ☐.

   • 6 × 1000 = 6000
   • 6 × 10 000 = 600 000
   • 6 × 10 000 = 60 000
   • 6 × 40 = 240
   Check

3. 3. Question 2b: complete 9 × 10⁴ = 9 × ☐ = ☐.

   • 9 × 10 000 = 900 000
   • 9 × 10 000 = 90 000
   • 9 × 1000 = 9000
   • 9 × 40 = 360
   Check

4. 4. Question 2c: complete 3 × 10⁴ = 3 × ☐ = ☐.

   • 3 × 1000 = 3000
   • 3 × 40 = 120
   • 3 × 10 000 = 300 000
   • 3 × 10 000 = 30 000
   Check

5. 5. Question 3a: complete 2 × 10⁵ = 2 × ☐ = ☐.

   • 2 × 50 = 100
   • 2 × 100 000 = 200 000
   • 2 × 1 000 000 = 2 000 000
   • 2 × 10 000 = 20 000
   Check

6. 6. Question 3b: complete 7 × 10⁵ = 7 × ☐ = ☐.

   • 7 × 50 = 350
   • 7 × 10 000 = 70 000
   • 7 × 100 000 = 700 000
   • 7 × 100 000 = 7 000 000
   Check

7. 7. Question 3c: complete 5 × 10⁵ = 5 × ☐ = ☐.

   • 5 × 100 000 = 500 000
   • 5 × 1 000 000 = 5 000 000
   • 5 × 50 = 250
   • 5 × 10 000 = 50 000
   Check

8. 8. Question 4a: 8 × 10³ =

   • 800
   • 8000
   • 80 000
   • 24
   Check

9. 9. Question 4b: 4 × 10⁶ =

   • 400 000
   • 24
   • 4 000 000
   • 40 000 000
   Check

10. 10. Question 4c: 3 × 10⁸ =

    • 300 000 000
    • 24
    • 30 000 000
    • 3 000 000
    Check

11. 11. Question 5: Rafa works out 6 000 000 ÷ 10⁵ by crossing 5 zeros off 6 000 000, which gives 60. Use Rafa's method to work out 800 000 ÷ 10⁵.

    • 8
    • 80
    • 0.8
    • 800
    Check

12. 12. Question 5b: use Rafa's method to work out 2 000 000 ÷ 10⁵.

    • 2000
    • 200
    • 2
    • 20
    Check

13. 13. Question 5c: use Rafa's method to work out 400 000 ÷ 10⁴.

    • 4000
    • 4
    • 400
    • 40
    Check

14. 14. Question 5d: use Rafa's method to work out 90 000 ÷ 10⁴.

    • 9
    • 900
    • 0.9
    • 90
    Check

15. 15. Question 5e: use Rafa's method to work out 3 000 000 ÷ 10⁶.

    • 0.3
    • 30
    • 300
    • 3
    Check

16. 16. Question 5f: use Rafa's method to work out 500 000 000 ÷ 10⁶.

    • 500
    • 50
    • 5
    • 5000
    Check

17. 17. Question 6a: 50 000 ÷ 10³ =

    • 50
    • 500
    • 5
    • 5000
    Check

18. 18. Question 6b: 710 000 ÷ 10⁴ =

    • 710
    • 71
    • 7.1
    • 7100
    Check

19. 19. Question 6c: 89 000 000 ÷ 10⁶ =

    • 89
    • 8.9
    • 8900
    • 890
    Check

20. 20. Question 6d: 470 000 000 ÷ 10⁵ =

    • 470
    • 4700
    • 47 000
    • 47
    Check