Primary 5 Mathematics Whole Numbers Quiz

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Primary 5 Mathematics Quiz - Whole Numbers

Name: ___________________________
Class: ___________________________
Date: ___________________________
Score: ___________ / 40

Duration: 50 minutes
Total Marks: 40

Instructions:

• This quiz tests Whole Numbers up to 10 million (reading, writing, place value, comparing, ordering, rounding, and simple operations within syllabus).
• Write your answers in the spaces provided.
• Show working where needed.
• Section A: 10 questions (1 mark each). Section B: 6 questions (2 marks each). Section C: 4 questions (3 marks each).

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Section A (1 mark each, Questions 1–10)

1. Write the number 4 205 318 in words.

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2. What is the value of the digit 7 in 7 432 109?

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3. Write "nine million six hundred four thousand fifty" in figures.

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4. Which is greater: 3 892 145 or 3 829 145?

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5. Round 6 748 213 to the nearest million.

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6. What is the place value of the digit 5 in 2 543 810?

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7. Arrange in ascending order: 5 102 344, 5 210 344, 5 012 344.

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8. Write 3 000 000 + 400 000 + 8 000 + 20 + 5 as a single number.

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9. What is 1 234 567 rounded to the nearest thousand?

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10. The population of a town is 8 750 000. Write this number in words.

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Section B (2 marks each, Questions 11–16)

11. A factory produced 2 345 678 toys in January and 3 210 455 toys in February. How many toys were produced in total?
    Working: ______________________________________________
    Answer: ______________________________________________

12. Round 9 856 432 to (a) the nearest hundred thousand, (b) the nearest ten thousand.
    (a) ____________________ (b) ____________________

13. Write the number 6 070 903 in expanded form (as a sum of digit values).

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14. A book has 1 205 300 words. Another has 1 250 003 words. How many more words does the second book have?
    Working: ______________________________________________
    Answer: ______________________________________________

15. The number 4 _ 62 890 has a missing digit. If the number is 4 562 890, what is the value of the missing digit's place?

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16. A country has 7 654 321 people. After 123 456 people moved away, how many remained?
    Working: ______________________________________________
    Answer: ______________________________________________

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Section C (3 marks each, Questions 17–20)

17. A company counted 5 432 100 red beads, 3 210 765 blue beads, and 2 105 432 green beads.
    (a) What is the total number of beads?
    (b) Round the total to the nearest million.
    Working: ______________________________________________
    Answers: (a) ___________ (b) ___________

18. The table shows the number of students in three schools.

School	Students
A	2 345 678
B	1 987 654
C	3 012 345

(a) Which school has the most students?
(b) Find the difference between School C and School B.
Working: ______________________________________________
Answers: (a) ___________ (b) ___________

19. A number is 8 000 000 + 40 000 + 300 + 9.
    (a) Write the number in figures.
    (b) Round it to the nearest hundred thousand.
    Working: ______________________________________________
    Answers: (a) ___________ (b) ___________

20. Town X has 6 789 012 people and Town Y has 6 798 210 people.
    (a) Which town has fewer people?
    (b) By how much?
    (c) Round Town Y's population to the nearest ten thousand.
    Working: ______________________________________________
    Answers: (a) ___________ (b) ___________ (c) ___________

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Primary 5 Mathematics Quiz - Whole Numbers (Answer Key)

Total Marks: 40
Topic: Whole Numbers up to 10 million

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Section A (1 mark each)

1. Four million two hundred five thousand three hundred eighteen
   Teaching: Read from left: 4 (millions) → 205 (thousands) → 318. No "and" used in Singapore number writing.

2. 7 000 000 (seven million)
   Teaching: Digit 7 is in the millions place, so its value is 7 × 1 000 000.

3. 9 604 050
   Teaching: nine million = 9 000 000; six hundred four thousand = 604 000; fifty = 50. Sum = 9 604 050.

4. 3 892 145
   Teaching: Compare digit by digit from left. At hundred-thousands: 8 > 2, so 3 892 145 is greater.

5. 7 000 000
   Teaching: Look at hundred-thousands digit (7). Since 7 ≥ 5, round up to 7 million.

6. Hundred thousands
   Teaching: 2 543 810 → digits: 2(mil) 5(hth) 4(tth) 3(th) 8(h) 1(t) 0(o). 5 is hundred thousands.

7. 5 012 344, 5 102 344, 5 210 344
   Teaching: Ascending = smallest first. Compare ten-thousands: 0 < 1 < 2.

8. 3 408 025
   Teaching: Add: 3 000 000 + 400 000 = 3 400 000; +8 000 = 3 408 000; +20 = 3 408 020; +5 = 3 408 025.

9. 1 235 000
   Teaching: Thousands digit is 4, next digit 5 → round up thousands to 5, so 1 235 000.

10. Eight million seven hundred fifty thousand
    Teaching: 8 750 000 → 8 million, 750 thousand. No hundreds/tens/ones stated.

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Section B (2 marks each)

11. 5 556 133 toys
    Working: 2 345 678 + 3 210 455 = 5 556 133.
    Marks: 1 for setup, 1 for correct sum.

12. (a) 9 900 000 (b) 9 860 000
    Teaching: (a) hundred-thousands digit 8 ≥ 5 → up to 9 900 000. (b) ten-thousands digit 5 → up to 9 860 000.
    Marks: 1 each.

13. 6 000 000 + 70 000 + 900 + 3
    Teaching: 6 070 903 = 6×1 000 000 + 0×100 000 + 7×10 000 + 0×1 000 + 9×100 + 0×10 + 3.
    Marks: 2 for correct expanded form.

14. 44 703 words
    Working: 1 250 003 − 1 205 300 = 44 703.
    Marks: 1 working, 1 answer.

15. Hundred thousands
    Teaching: 4 562 890 → missing digit 5 is in hundred thousands place.
    Marks: 2 for identifying place.

16. 7 530 865 people
    Working: 7 654 321 − 123 456 = 7 530 865.
    Marks: 1 working, 1 answer.

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Section C (3 marks each)

17. (a) 10 748 297 (b) 11 000 000
    Working: 5 432 100 + 3 210 765 = 8 642 865; + 2 105 432 = 10 748 297. Round to nearest million: hundred-thousands digit 7 ≥ 5 → 11 000 000.
    Marks: 2 for total, 1 for rounding.

18. (a) School C (b) 1 024 691
    Working: C = 3 012 345 is largest. Difference: 3 012 345 − 1 987 654 = 1 024 691.
    Marks: 1 for (a), 2 for (b) with working.

19. (a) 8 040 309 (b) 8 000 000
    Working: 8 000 000 + 40 000 + 300 + 9 = 8 040 309. Round to nearest hundred thousand: ten-thousands digit 4 < 5 → 8 000 000.
    Marks: 1 each part.

20. (a) Town X (b) 9 198 (c) 6 800 000
    Working: X = 6 789 012 < Y = 6 798 210. Difference: 6 798 210 − 6 789 012 = 9 198. Y rounded to nearest ten thousand: thousands digit 8 ≥ 5 → 6 800 000.
    Marks: 1 each part.

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Common mistakes to flag:

• Writing "and" in whole numbers (e.g., "four million and two hundred…") is not standard in Singapore primary maths.
• Rounding errors from wrong place value digit.
• Expanded form must show actual digit values, not just digits.