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Primary 6 PSLE Mathematics Whole Numbers Quiz

Free P6 PSLE Maths Whole Numbers quiz, LongCat AI version, with questions, answers, and PSLE-focused practice for Singapore students.

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Primary 6 PSLE Mathematics AI Generated Generated by LongCat 2.0 LLM Updated 2026-08-17

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Questions

Primary 6 PSLE Mathematics Quiz - Whole Numbers

Name: _______________________
Class: _______________________
Date: _______________________
Score: _______ / 40

Duration: 50 minutes
Total Marks: 40

Instructions

Answer all questions.
Show your working clearly in the space provided.
Use a calculator only where permitted (this paper: no calculator).
Write your final answer in the answer space or on the line provided.
Each question carries the marks shown in brackets [ ].

Section A: Numbers to 10 Million and Place Value (Questions 1–5)

1. Write the following number in numerals.

Three million, four hundred and five thousand, two hundred and eight.

Answer: _______________________
[1 mark]

2. In the number 7,362,815, what is the value represented by the digit 6?

Answer: _______________________
[1 mark]

3. Arrange the following numbers in ascending order.

4,502,100 4,520,100 4,502,010 4,520,010

Answer: _________, _________, _________, _________
[2 marks]

4. Round 3,784,562 to the nearest hundred thousand.

Answer: _______________________
[1 mark]

5. Fill in the missing number.

5,000,000 + 300,000 + _______ + 40 + 6 = 5,360,046

Answer: _______________________
[1 mark]

Section B: Factors, Multiples, and Prime Numbers (Questions 6–10)

6. List all the factors of 36.

Answer: _________________________________________________
[2 marks]

7. Write down the first five multiples of 15.

Answer: _________________________________________________
[2 marks]

8. Which of the following numbers is a prime number?

21 23 25 27

Answer: _______________________
[1 mark]

9. Find the Highest Common Factor (HCF) of 24 and 36.

Answer: _______________________
[2 marks]

10. Find the Lowest Common Multiple (LCM) of 6 and 8.

Answer: _______________________
[2 marks]

Section C: Order of Operations (Questions 11–15)

11. Calculate: 48 + 12 × 5

Answer: _______________________
[2 marks]

12. Calculate: (72 − 24) ÷ 8 + 15

Answer: _______________________
[2 marks]

13. Calculate: 150 − 6 × (14 + 6)

Answer: _______________________
[2 marks]

14. Calculate: 200 ÷ (3 + 2) × 4 − 35

Answer: _______________________
[2 marks]

15. Insert brackets to make the following statement true.

18 + 6 × 3 − 4 = 68

Answer: _________________________________________________
[2 marks]

Section D: Word Problems (Questions 16–20)

16. A factory produced 245,600 toys in January and 318,450 toys in February. How many toys did the factory produce in the two months altogether?

Answer: _______________________
[2 marks]

17. A school has 1,248 students. They are divided equally into 24 classes. How many students are in each class?

Answer: _______________________
[2 marks]

18. Mr Tan bought 15 boxes of oranges. Each box contained 24 oranges. He repacked the oranges equally into 9 bags. How many oranges were in each bag?

Answer: _______________________
[3 marks]

19. A library had 56,300 books. It received a donation of 12,450 books and then lent out 23,780 books. How many books remained in the library?

Answer: _______________________
[3 marks]

20. The population of Town A is 2,450,000. The population of Town B is 1,785,000. Town C has a population that is 950,000 more than the combined population of Town A and Town B.

(a) What is the combined population of Town A and Town B?

Answer: _______________________
[1 mark]

(b) What is the population of Town C?

Answer: _______________________
[2 marks]

— End of Quiz —

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Answers

Primary 6 PSLE Mathematics Quiz — Answer Key

Topic: Whole Numbers

Section A: Numbers to 10 Million and Place Value

1. 3,405,208
Working: 3,000,000 + 405,000 + 200 + 8 = 3,405,208.
[1 mark]

2. 60,000
Working: The digit 6 is in the ten-thousands place. 6 × 10,000 = 60,000.
[1 mark]

3. 4,502,010, 4,502,100, 4,520,010, 4,520,100
Working: Compare digit by digit from the left. All start with 4,5. The third digit from the left (thousands place) distinguishes them: 0 < 2, and within each group, 010 < 100.
[2 marks — 1 mark for correct order, 1 mark for all four correct]

4. 3,800,000
Working: The hundred-thousands digit is 7. The ten-thousands digit is 8 (≥ 5), so round up: 3,700,000 → 3,800,000.
[1 mark]

5. 60,000
Working: 5,000,000 + 300,000 + ___ + 40 + 6 = 5,360,046. The missing place is the ten-thousands place. 5,360,046 − 5,300,046 = 60,000.
[1 mark]

Section B: Factors, Multiples, and Prime Numbers

6. 1, 2, 3, 4, 6, 9, 12, 18, 36
Working: Find all pairs that multiply to 36: 1×36, 2×18, 3×12, 4×9, 6×6.
[2 marks — 1 mark for at least 6 correct factors, 2 marks for all 9]

7. 15, 30, 45, 60, 75
Working: 15×1=15, 15×2=30, 15×3=45, 15×4=60, 15×5=75.
[2 marks — 1 mark for first three correct, 2 marks for all five]

8. 23
Working: 21 = 3×7 (not prime), 23 has only factors 1 and 23 (prime), 25 = 5×5 (not prime), 27 = 3×9 (not prime).
[1 mark]

9. 12
    Working: Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24. Factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, 36. Common factors: 1, 2, 3, 4, 6, 12. Highest = 12.
    Alternative: Prime factorisation: 24 = 2³×3, 36 = 2²×3². HCF = 2²×3 = 12.
    [2 marks — 1 for method, 1 for correct answer]

10. 24
    Working: Multiples of 6: 6, 12, 18, 24, 30… Multiples of 8: 8, 16, 24, 32… Lowest common = 24.
    Alternative: LCM = (6×8) / HCF(6,8) = 48/2 = 24.
    [2 marks — 1 for method, 1 for correct answer]

Section C: Order of Operations

11. 108
Working: Multiplication first: 12 × 5 = 60. Then addition: 48 + 60 = 108.
[2 marks — 1 for correct order, 1 for correct answer]

12. 21
Working: Brackets first: 72 − 24 = 48. Then division: 48 ÷ 8 = 6. Then addition: 6 + 15 = 21.
[2 marks — 1 for correct order, 1 for correct answer]

13. 30
Working: Brackets first: 14 + 6 = 20. Then multiplication: 6 × 20 = 120. Then subtraction: 150 − 120 = 30.
[2 marks — 1 for correct order, 1 for correct answer]

14. 125
Working: Brackets first: 3 + 2 = 5. Then division and multiplication left to right: 200 ÷ 5 = 40; 40 × 4 = 160. Then subtraction: 160 − 35 = 125.
[2 marks — 1 for correct order, 1 for correct answer]

15. (18 + 6) × 3 − 4 = 68
Working: (18 + 6) = 24; 24 × 3 = 72; 72 − 4 = 68. ✓
[2 marks — 1 for correct bracket placement, 1 for verification]

Section D: Word Problems

16. 564,050 toys
Working: 245,600 + 318,450 = 564,050.
[2 marks — 1 for correct operation, 1 for correct answer]

17. 52 students
Working: 1,248 ÷ 24 = 52.
[2 marks — 1 for correct operation, 1 for correct answer]

18. 40 oranges
Working: Total oranges = 15 × 24 = 360. Oranges per bag = 360 ÷ 9 = 40.
[3 marks — 1 for finding total, 1 for correct division, 1 for final answer with unit]

19. 44,970 books
Working: After donation: 56,300 + 12,450 = 68,750. After lending: 68,750 − 23,780 = 44,970.
[3 marks — 1 for addition step, 1 for subtraction step, 1 for final answer with unit]

20.
    (a) 4,235,000
        Working: 2,450,000 + 1,785,000 = 4,235,000.
        [1 mark]

    (b) 5,185,000
        Working: 4,235,000 + 950,000 = 5,185,000.
        [2 marks — 1 for using answer from (a), 1 for correct final answer]

Total: 40 marks

Marking Notes

Award method marks where working is shown even if the final answer is incorrect, provided the method is valid.
For questions requiring units, the final answer mark is only awarded if the unit is stated.
Common mistakes to watch for:
- Q11–14: Students who work left-to-right without following BODMAS/PEMDAS.
- Q6: Missing factors (commonly 9 or 18 omitted).
- Q18: Forgetting to find the total before dividing.
- Q20(b): Students who ignore part (a) and attempt an incorrect independent calculation.