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Primary 5 Mathematics Whole Numbers Quiz

Free P5 Maths Whole Numbers quiz, HY3 Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.

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Primary 5 Mathematics From Real Exams Generated by Tencent HY3 Free Updated 2026-08-17
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Answers

Primary 5 Mathematics Quiz - Whole Numbers (Answer Key)

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

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.

Section B (2 marks each)

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

  2. (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.

  3. 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.

  4. 44 703 words
    Working: 1 250 003 − 1 205 300 = 44 703.
    Marks: 1 working, 1 answer.

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

  6. 7 530 865 people
    Working: 7 654 321 − 123 456 = 7 530 865.
    Marks: 1 working, 1 answer.

Section C (3 marks each)

  1. (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.

  2. (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.

  3. (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.

  4. (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.

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.