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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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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 —
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.
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