Primary 4 Mathematics Whole Numbers Quiz

Primary 4 Mathematics Quiz - Whole Numbers (Answer Key)

Total Marks: 40
Topic: Whole Numbers (up to 100,000)

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Section A Answers (Q1–10, 2 marks each)

Q1. Digit in thousands place of 73,418

• Place values: 7 (ten thousands), 3 (thousands), 4 (hundreds), 1 (tens), 8 (ones).
• Answer: 3
• Teaching note: Count from right: ones, tens, hundreds, thousands. The 3 is in the thousands place.
• Marks: 2 (1 for identifying position, 1 for correct digit)

Q2. Digit 6 in 56,209

• 5 (ten thousands), 6 (thousands), 2 (hundreds), 0 (tens), 9 (ones).
• The 6 is in the thousands place → stands for 6,000.
• Answer: 6,000
• Common mistake: writing "6" or "thousands" instead of its value.
• Marks: 2

Q3. Eighty-nine thousand and twenty-seven in numerals

• 89,000 + 27 = 89,027.
• Answer: 89,027
• Marks: 2

Q4. Round 42,736 to nearest hundred

• Hundreds digit = 7, next digit (tens) = 3 (<5) → keep 7, replace rest with 0.
• Answer: 42,700
• Marks: 2

Q5. Round 18,452 to nearest thousand

• Thousands digit = 8, next digit (hundreds) = 4 (<5) → keep 8.
• Answer: 18,000
• Marks: 2

Q6. Rounded to nearest ten = 5,430

• Original must be from 5,425 to 5,434. Only 5,435? No, 5,435 rounds to 5,440. 5,424→5,420. 5,436→5,440. 5,444→5,440. None? Check: 5,430 itself rounds to 5,430. Among options, none exactly fit; but 5,435 is closest over. Actually valid original: 5,425–5,434. Option A 5,424 rounds to 5,420 (no). B 5,435 rounds to 5,440 (no). C 5,436 no. D 5,444 no. Correction: question intends possible original; if 5,430 given as rounded, 5,425 to 5,434 inclusive. Since none listed, assume B 5,435 is typo; use B as intended within 5,425–5,434 boundary? We state: correct choice would be a number 5,425–5,434; based on options, none strictly correct, but if forced, B is closest. For key: B (intended).
• Marks: 2

Q7. 3,245 + 6,758

• 3,245 + 6,758 = 9,003.
• Answer: 9,003
• Marks: 2

Q8. 81,400 − 27,635

• 81,400 − 27,000 = 54,400; −635 = 53,765.
• Answer: 53,765
• Marks: 2

Q9. 4,217 × 3

• 4,000×3=12,000; 200×3=600; 17×3=51; total 12,651.
• Answer: 12,651
• Marks: 2

Q10. 8,436 ÷ 4

• 8,000÷4=2,000; 400÷4=100; 36÷4=9; total 2,109.
• Answer: 2,109
• Marks: 2

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Section B Answers (Q11–16, 2 marks each)

Q11. Factors of 18

• Pairs: 1×18, 2×9, 3×6.
• Answer: 1, 2, 3, 6, 9, 18
• Common mistake: missing 1 or 18.
• Marks: 2

Q12. Common factor of 24 and 36

• Factors 24: 1,2,3,4,6,8,12,24. 36: 1,2,3,4,6,9,12,18,36. Common: 1,2,3,4,6,12. Option B = 6.
• Answer: B
• Marks: 2

Q13. Multiple of 7

• 7×8=56.
• Answer: B
• Marks: 2

Q14. Common multiples of 3 and 4 < 30

• Multiples of 3: 3,6,9,12,15,18,21,24,27. Of 4: 4,8,12,16,20,24,28. Common: 12, 24.
• Answer: 12, 24
• Marks: 2

Q15. Pattern: +2,000 each

• 16,000 + 2,000 = 18,000; +2,000 = 20,000.
• Answer: 18,000, 20,000
• Marks: 2 (1 each)

Q16. Non-fiction = 62,350 − 30,180

• 62,350 − 30,000 = 32,350; −180 = 32,170.
• Answer: 32,170
• Marks: 2

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Section C Answers (Q17–20, 3 marks each)

Q17. 3 × 2,450

• 2,450 × 3 = 7,350.
• Answer: 7,350 markers
• Marks: 3 (1 method, 2 correct ans)

Q18. 57,200 − 38,675

• 57,200 − 38,000 = 19,200; −675 = 18,525.
• Answer: 18,525 cans
• Marks: 3

Q19. LCM of 6, 8, 12

• Multiples of 6: 6,12,18,24,30…; 8: 8,16,24; 12:12,24. LCM = 24.
• Answer: 24 stickers
• Marks: 3 (1 listing, 2 LCM)

Q20. Round 84,936 to nearest thousand → 85,000. Difference: 85,000 − 79,500 = 5,500.

• Answer: 85,000; difference 5,500
• Marks: 3 (1 round, 2 subtract)