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Primary 6 PSLE Mathematics Whole Numbers Quiz

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Questions

Primary 6 PSLE Mathematics Quiz - Whole Numbers

Name: ___________________________
Class: Primary 6 _______
Date: _______________
Score: ______ / 50

Duration: 50 minutes
Total Marks: 50

Instructions:

Answer all questions.
Show your working clearly in the space provided.
Write your answers in the blanks provided.
For Section C, show all steps of your working.

Section A: Multiple-Choice Questions (10 × 1 mark = 10 marks)

Choose the correct answer and write its number (1, 2, 3 or 4) in the brackets provided.

1. Which of the following numbers is the largest?
(1) 8 045 210
(2) 8 054 120
(3) 8 405 210
(4) 8 450 120
Answer: (_____)

2. Round 5 678 924 to the nearest ten thousand.
(1) 5 670 000
(2) 5 680 000
(3) 5 678 000
(4) 5 679 000
Answer: (_____)

3. What is the value of the digit 7 in 3 724 581?
(1) 70 000
(2) 700 000
(3) 7 000 000
(4) 7 000
Answer: (_____)

4. Find the product of 4 528 and 37.
(1) 167 536
(2) 167 546
(3) 167 636
(4) 167 646
Answer: (_____)

5. Divide 8 456 by 32. What is the remainder?
(1) 8
(2) 16
(3) 24
(4) 28
Answer: (_____)

6. Which of the following is a common multiple of 6 and 8?
(1) 24
(2) 36
(3) 42
(4) 54
Answer: (_____)

7. The product of two whole numbers is 1 296. If one of the numbers is 27, what is the other number?
(1) 48
(2) 46
(3) 44
(4) 42
Answer: (_____)

8. A number when divided by 15 gives a quotient of 234 and a remainder of 7. What is the number?
(1) 3 517
(2) 3 511
(3) 3 507
(4) 3 501
Answer: (_____)

9. Find the value of $240 \div 8 \times 5 + 36 \div 6$ .
(1) 156
(2) 150
(3) 146
(4) 140
Answer: (_____)

10. There are 4 820 books in a library. They are packed equally into 25 boxes. How many books are left unpacked?
(1) 15
(2) 20
(3) 25
(4) 30
Answer: (_____)

Section B: Short-Answer Questions (10 × 2 marks = 20 marks)

Show your working clearly and write your answers in the blanks provided.

11. Write 6 045 302 in words.

12. Find the value of $7 248 \times 46$ .

13. Divide 9 635 by 28. Express your answer as a quotient and remainder.

14. Find the greatest common factor of 84 and 126.

15. Find the least common multiple of 18, 24 and 36.

16. A factory produces 3 450 toys each day. How many toys does it produce in 26 days?

17. Mr Tan had $8 500. He spent$ 2 345 on a television and $1 680 on a refrigerator. How much money had he left?

18. Find the value of $5 400 \div (15 + 5) \times 4 - 120$ .

19. A number is between 50 and 100. It is a multiple of 7 and a factor of 294. What is the number?

20. There are 1 248 students in a school. They are grouped into teams of 16 for a competition. How many teams are formed and how many students are left without a team?

End of Quiz

Answers

Primary 6 PSLE Mathematics Quiz - Whole Numbers (Answer Key)

Total Marks: 50

Section A: Multiple-Choice Questions (10 × 1 mark = 10 marks)

1. Answer: (3)
Explanation: Compare the numbers digit by digit from the left (millions place). All have 8 millions. Compare hundred-thousands: (1) 0, (2) 0, (3) 4, (4) 4. So (3) and (4) are larger. Compare ten-thousands: (3) 0, (4) 5. Thus 8 450 120 is the largest.

2. Answer: (2)
Explanation: To round to the nearest ten thousand, look at the thousands digit (8 in 5 678 924). Since 8 ≥ 5, round up the ten-thousands digit (7) to 8. The number becomes 5 680 000.

3. Answer: (2)
Explanation: The digit 7 is in the hundred-thousands place. Its value is 7 × 100 000 = 700 000.

4. Answer: (1)
Working:
$4 528 \times 37 = 4 528 \times (30 + 7) = 4 528 \times 30 + 4 528 \times 7$
$= 135 840 + 31 696 = 167 536$

5. Answer: (1)
Working:
$8 456 \div 32$
$32 \times 264 = 8 448$
Remainder = $8 456 - 8 448 = 8$

6. Answer: (1)
Explanation: Multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48...
Multiples of 8: 8, 16, 24, 32, 40, 48...
Common multiples: 24, 48... The smallest is 24.

7. Answer: (1)
Working:
$1 296 \div 27 = 48$
Check: $27 \times 48 = 27 \times 50 - 27 \times 2 = 1 350 - 54 = 1 296$

8. Answer: (1)
Working:
Number = Divisor × Quotient + Remainder
$= 15 \times 234 + 7 = 3 510 + 7 = 3 517$

9. Answer: (1)
Working:
Follow order of operations (÷ and × before +):
$240 \div 8 \times 5 + 36 \div 6$
$= 30 \times 5 + 6$
$= 150 + 6 = 156$

10. Answer: (2)
Working:
$4 820 \div 25 = 192$ remainder $20$
Check: $25 \times 192 = 4 800$ , $4 820 - 4 800 = 20$

Section B: Short-Answer Questions (10 × 2 marks = 20 marks)

11. Answer: Six million, forty-five thousand, three hundred and two.
Marking: 2 marks for correct words; 1 mark if only one error (e.g., missing "and" or hyphen).

12. Answer: 333 408
Working:
$7 248 \times 46 = 7 248 \times (40 + 6)$
$= 289 920 + 43 488 = 333 408$
Marking: 1 mark for correct method (partitioning), 1 mark for correct answer.

13. Answer: Quotient 344, Remainder 3
Working:
$9 635 \div 28$
$28 \times 344 = 9 632$
Remainder = $9 635 - 9 632 = 3$
Marking: 1 mark for correct quotient, 1 mark for correct remainder.

14. Answer: 42
Working:
Factors of 84: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
Factors of 126: 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126
Common factors: 1, 2, 3, 6, 7, 14, 21, 42
Greatest common factor = 42
Marking: 1 mark for correct method (listing factors or prime factorisation), 1 mark for correct answer.

15. Answer: 72
Working:
Multiples of 18: 18, 36, 54, 72, 90...
Multiples of 24: 24, 48, 72, 96...
Multiples of 36: 36, 72, 108...
Least common multiple = 72
Marking: 1 mark for correct method (listing multiples or prime factorisation), 1 mark for correct answer.

16. Answer: 89 700 toys
Working:
$3 450 \times 26 = 3 450 \times (20 + 6)$
$= 69 000 + 20 700 = 89 700$
Marking: 1 mark for correct method, 1 mark for correct answer.

17. Answer: $4 475 **Working:** Total spent =$ 2 345 + $1 680 =$ 4 025
Money left = $8 500 -$ 4 025 = $4 475
Marking: 1 mark for correct total spent, 1 mark for correct final answer.

18. Answer: 960
Working:
$5 400 \div (15 + 5) \times 4 - 120$
$= 5 400 \div 20 \times 4 - 120$ (brackets first)
$= 270 \times 4 - 120$ (division before multiplication, left to right)
$= 1 080 - 120$ (multiplication before subtraction)
$= 960$
Marking: 1 mark for correct order of operations, 1 mark for correct answer.

19. Answer: 98
Working:
Multiples of 7 between 50 and 100: 56, 63, 70, 77, 84, 91, 98
Factors of 294: 1, 2, 3, 6, 7, 14, 21, 42, 49, 98, 147, 294
Common number = 98
Marking: 1 mark for correct listing/identification, 1 mark for correct answer.

20. Answer: 78 teams, 0 students left
Working:
$1 248 \div 16 = 78$ remainder $0$
Check: $16 \times 78 = 1 248$
Marking: 1 mark for correct number of teams, 1 mark for correct remainder.

End of Answer Key