Math 9 · Unit 3: Decimals, percentages and rounding · Cambridge Lower Secondary Maths Stage 9

Questions

1. 1. 4 × 3 = 12. What is 4 × 0.3?

   • 12
   • 0.12
   • 1.2
   • 120
   Check

2. 2. Work out 7 × 0.4.

   • 2.8
   • 28
   • 0.28
   • 11
   Check

3. 3. Work out 9 × −0.1.

   • −0.09
   • −9
   • 0.9
   • −0.9
   Check

4. 4. Work out −15 × 0.2.

   • 3
   • −30
   • −3
   • −0.3
   Check

5. 5. Work out 8 × 0.02.

   • 0.016
   • 1.6
   • 16
   • 0.16
   Check

6. 6. Work out −5 × −0.04.

   • 0.02
   • 0.2
   • −0.2
   • 20
   Check

7. 7. Work out 11 × 0.07.

   • 0.077
   • 0.77
   • 77
   • 7.7
   Check

8. 8. Multiply both numbers by 10 to work out 6 ÷ 0.3.

   • 20
   • 2
   • 0.2
   • 18
   Check

9. 9. Multiply both numbers by 10 to work out 8 ÷ 0.2.

   • 40
   • 1.6
   • 0.4
   • 4
   Check

10. 10. Work out −9 ÷ 0.1.

    • −0.9
    • −9.1
    • 90
    • −90
    Check

11. 11. Work out 12 ÷ 0.4.

    • 48
    • 0.3
    • 3
    • 30
    Check

12. 12. Work out 6 ÷ −0.02.

    • 300
    • −0.12
    • −300
    • −3
    Check

13. 13. Work out 8 ÷ 0.04.

    • 200
    • 0.32
    • 20
    • 2
    Check

14. 14. Work out −16 ÷ −0.08.

    • 200
    • 20
    • 2
    • −200
    Check

15. 15. Work out 4 × 0.3 mentally.

    • 0.12
    • 12
    • 1.2
    • 4.3
    Check

16. 16. Work out 13 × 0.2 mentally.

    • 26
    • 0.26
    • 1.3
    • 2.6
    Check

17. 17. Work out 4 × 0.9 mentally.

    • 3.6
    • 0.36
    • 4.9
    • 36
    Check

18. 18. Work out 0.9 × −9 mentally.

    • −0.81
    • −81
    • 8.1
    • −8.1
    Check

19. 19. Work out 0.3 × 11 mentally.

    • 11.3
    • 0.33
    • 3.3
    • 33
    Check

20. 20. Work out 8 × −0.03 mentally.

    • −2.4
    • 0.24
    • −0.024
    • −0.24
    Check