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

Questions

1. 1. A whole number is rounded to the nearest 10 and the answer is 120. Use the number line: which whole numbers round to 120?

   • 116 to 124
   • 115 to 125
   • 110 to 130
   • 115 to 124
   Check

2. 2. A whole number is rounded to the nearest 10 and the answer is 120. Use the number line to write the lower bound.

   • 116
   • 120
   • 110
   • 115
   Check

3. 3. A whole number is rounded to the nearest 10 and the answer is 120. Use the number line to write the upper bound.

   • 124
   • 120
   • 130
   • 125
   Check

4. 4. A whole number is rounded to the nearest 10 and the answer is 70. Use the number line: which whole numbers round to 70?

   • 65 to 75
   • 65 to 74
   • 60 to 80
   • 66 to 74
   Check

5. 5. A whole number is rounded to the nearest 10 and the answer is 70. Use the number line to write the lower bound.

   • 70
   • 66
   • 60
   • 65
   Check

6. 6. A whole number is rounded to the nearest 10 and the answer is 70. Use the number line to write the upper bound.

   • 74
   • 75
   • 80
   • 70
   Check

7. 7. A number with one decimal place is rounded to the nearest whole number. The answer is 25. Use the number line: which values can it take?

   • 24 to 26
   • 24.5 to 25.5
   • 24.6 to 25.4
   • 24.5 to 25.4
   Check

8. 8. A number with one decimal place is rounded to the nearest whole number. The answer is 25. Use the number line to write the lower bound.

   • 24
   • 24.4
   • 24.5
   • 25
   Check

9. 9. A number with one decimal place is rounded to the nearest whole number. The answer is 25. Use the number line to write the upper bound.

   • 25.4
   • 25.5
   • 25
   • 26
   Check

10. 10. A number with one decimal place is rounded to the nearest whole number. The answer is 8. Use the number line: which values can it take?

    • 7.6 to 8.4
    • 7.5 to 8.5
    • 7 to 9
    • 7.5 to 8.4
    Check

11. 11. A number with one decimal place is rounded to the nearest whole number. The answer is 8. Use the number line to write the lower bound.

    • 8
    • 7.5
    • 7.4
    • 7
    Check

12. 12. A number with one decimal place is rounded to the nearest whole number. The answer is 8. Use the number line to write the upper bound.

    • 9
    • 8.6
    • 8.4
    • 8.5
    Check

13. 13. A decimal number is rounded to the nearest whole number. The answer is 3. Use the number line to write the lower bound.

    • 2.4
    • 2
    • 3
    • 2.5
    Check

14. 14. A decimal number is rounded to the nearest whole number. The answer is 3. Use the number line to write the upper bound.

    • 4
    • 3.5
    • 3.4
    • 3
    Check

15. 15. A decimal number is rounded to the nearest 10 and the answer is 90. Use the number line to write the lower bound.

    • 80
    • 84
    • 85
    • 90
    Check

16. 16. A decimal number is rounded to the nearest 10 and the answer is 90. Use the number line to write the upper bound.

    • 94
    • 95
    • 100
    • 99
    Check

17. 17. A decimal number is rounded to the nearest whole number. Which inequality shows the range of values it can be when the answer is 7?

    • 7 ≤ x < 8
    • 6 ≤ x < 8
    • 6.5 ≤ x < 7.5
    • 6.5 < x ≤ 7.5
    Check

18. 18. A decimal number rounds to 28 to the nearest whole number. Write the inequality.

    • 27.5 < x ≤ 28.5
    • 27 ≤ x < 29
    • 27.5 ≤ x < 28.5
    • 28 ≤ x < 29
    Check

19. 19. A decimal number rounds to 135 to the nearest whole number. Write the inequality.

    • 130 ≤ x < 140
    • 134.5 ≤ x < 135.5
    • 135 ≤ x < 136
    • 134 ≤ x < 136
    Check

20. 20. A decimal number rounds to 559 to the nearest whole number. Write the inequality.

    • 558.5 < x ≤ 559.5
    • 559 ≤ x < 560
    • 558.5 ≤ x < 559.5
    • 558 ≤ x < 560
    Check