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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: 45 minutes
Total Marks: 50

Instructions:

Answer all questions.
Show your working clearly in the space provided.
Write your answers in the spaces provided.
The use of calculators is NOT allowed.

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

For each question, four options are given. Choose the correct answer and write its number (1, 2, 3 or 4) in the brackets provided.

1. In the number 4 728 391, what is the value of the digit 7?
(1) 70 000
(2) 700 000
(3) 7 000 000
(4) 70 000 000
Answer: (_____)

2. Round off 3 847 256 to the nearest ten thousand.
(1) 3 840 000
(2) 3 850 000
(3) 3 800 000
(4) 3 900 000
Answer: (_____)

3. Which of the following numbers is a common multiple of 6 and 8?
(1) 24
(2) 36
(3) 42
(4) 56
Answer: (_____)

4. Find the value of 48 000 ÷ 600.
(1) 8
(2) 80
(3) 800
(4) 8 000
Answer: (_____)

5. A number when divided by 9 gives a quotient of 4 325 and a remainder of 7. What is the number?
(1) 38 925
(2) 38 932
(3) 38 939
(4) 39 002
Answer: (_____)

6. What is the missing number in the box?
$5 \times (24 + 16) = (5 \times 24) + (\square \times 16)$
(1) 5
(2) 16
(3) 24
(4) 40
Answer: (_____)

7. There are 2 345 pupils in a school. Each pupil donated $4 to charity. How much money was collected in total? (1)$ 9 380
(2) $9 385 (3)$ 9 390
(4) $9 395
Answer: (_____)

8. What is the product of the first three multiples of 12?
(1) 1 728
(2) 5 184
(3) 6 912
(4) 10 368
Answer: (_____)

9. A factory produced 15 600 toys in 5 days. It produced the same number of toys each day. How many toys did it produce in one day?
(1) 3 120
(2) 3 102
(3) 3 012
(4) 3 002
Answer: (_____)

10. Which of the following has the same value as $72 \times 99$ ?
(1) $72 \times 100 - 1$
(2) $72 \times 100 - 72$
(3) $72 \times 100 - 99$
(4) $72 \times 100 + 72$
Answer: (_____)

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

Show your working clearly and write your answers in the spaces provided. Give your answers in the units stated.

11. Write five million, three hundred thousand and forty-two in numerals.
Ans: ___________________________

12. Find the value of $3 456 \times 27$ .
Ans: ___________________________

13. Find the value of $8 000 - 2 345 \times 2$ .
Ans: ___________________________

14. What is the remainder when 56 789 is divided by 8?
Ans: ___________________________

15. The sum of two numbers is 12 450. The smaller number is 4 875. What is the larger number?
Ans: ___________________________

16. A number is a multiple of 5. When divided by 6, it has a remainder of 3. The number is between 50 and 80. What is the number?
Ans: ___________________________

17. There are 36 girls and 48 boys in a hall. They are to be grouped into teams with an equal number of girls and an equal number of boys in each team. What is the greatest number of teams that can be formed?
Ans: ___________________________

18. A box contains 4 500 marbles. They are packed into packets of 15 marbles each. How many packets are there?
Ans: ___________________________

19. Find the value of $125 \times 32 \times 25$ .
Ans: ___________________________

20. A machine prints 450 pages per minute. How many pages can it print in 2 hours?
Ans: ___________________________

End of Paper
Please check your work carefully.

Answers

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

Total Marks: 50

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

Question	Answer	Explanation
1	(2)	The digit 7 is in the hundred thousands place. Value = $7 \times 100,000 = 700,000$ .
2	(2)	Look at the thousands digit (7). Since $7 \ge 5$ , round up the ten thousands digit (4 $\to$ 5). $3,847,256 \approx 3,850,000$ .
3	(1)	Multiples of 6: 6, 12, 18, 24, 30... Multiples of 8: 8, 16, 24, 32... LCM = 24.
4	(2)	$48,000 \div 600 = 480 \div 6 = 80$ . (Cancel two zeros from both numbers).
5	(2)	Number = (Divisor $\times$ Quotient) + Remainder = $(9 \times 4,325) + 7 = 38,925 + 7 = 38,932$ .
6	(1)	Distributive Property: $a \times (b + c) = (a \times b) + (a \times c)$ . The missing number is 5.
7	(1)	$2,345 \times 4 = 9,380$ .
8	(4)	First three multiples of 12: 12, 24, 36. Product = $12 \times 24 \times 36 = 288 \times 36 = 10,368$ .
9	(1)	$15,600 \div 5 = 3,120$ .
10	(2)	$72 \times 99 = 72 \times (100 - 1) = 72 \times 100 - 72 \times 1 = 72 \times 100 - 72$ .

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

Question	Answer	Working / Explanation
11	5 300 042	5 million = 5,000,000; 300 thousand = 300,000; 42 = 42. Sum = 5,300,042.
12	93 312	$3,456 \times 20 = 69,120$ ; $3,456 \times 7 = 24,192$ ; $69,120 + 24,192 = 93,312$ .
13	3 310	Order of Operations: Multiplication first. $2,345 \times 2 = 4,690$ . $8,000 - 4,690 = 3,310$ .
14	5	Divide last 3 digits by 8: $789 \div 8 = 98$ R $5$ . Or $56,000$ is divisible by 8 ( $7,000 \times 8$ ). $789 \div 8 = 98$ R $5$ .
15	7 575	Larger number = Sum - Smaller number = $12,450 - 4,875 = 7,575$ .
16	75	Multiples of 5 between 50-80: 55, 60, 65, 70, 75, 80. Check $\div 6$ rem 3: $55 \div 6 = 9$ R 1; $60 \div 6 = 10$ R 0; $65 \div 6 = 10$ R 5; $70 \div 6 = 11$ R 4; $75 \div 6 = 12$ R 3; $80 \div 6 = 13$ R 2.
17	12	Greatest number of teams = HCF of 36 and 48. $36 = 12 \times 3$ , $48 = 12 \times 4$ . HCF = 12.
18	300	$4,500 \div 15 = 450 \div 1.5 = 300$ . Or $4,500 \div 5 = 900$ , $900 \div 3 = 300$ .
19	100 000	$125 \times 8 = 1,000$ . Group $32$ as $4 \times 8$ . $125 \times 25 \times 32 = (125 \times 8) \times (25 \times 4) = 1,000 \times 100 = 100,000$ .
20	54 000	2 hours = 120 minutes. $450 \times 120 = 450 \times 12 \times 10 = 5,400 \times 10 = 54,000$ .

Section C: Problem Sums (5 × 4 marks = 20 marks)

11. (4 marks)

Working:

Cost of washing machine = $3,850 -$ 1,200 = $2,650.
Total spent = $3,850 +$ 2,650 = $6,500.
Remaining money = $15,000 -$ 6,500 = $8,500.
Amount per charity = $8,500 \div 5 =$ 1,700.

Ans: $1,700

12. (4 marks)

Working: (a) Number of boxes = $24,560 \div 32 = 767$ . (b) Total money = $767 \times$ 15 = $11,505. ($ 767 \times 10 = 7,670 $;$ 767 \times 5 = 3,835 $;$ 7,670 + 3,835 = 11,505$)

(a) Ans: 767
(b) Ans: $11,505

13. (4 marks)

Working:

Blue beads = $3,456 \times 3 = 10,368$ .
Yellow beads = $10,368 - 1,245 = 9,123$ .
Total beads = $3,456 + 10,368 + 9,123 = 22,947$ .

Ans: 22,947

14. (4 marks)

Working:

The Number = $(7 \times 1,234) + 5 = 8,638 + 5 = 8,643$ .
$8,643 \div 6$ : $8,640 \div 6 = 1,440$ . Remainder = 3. Quotient = 1,440, Remainder = 3.

Ans: Quotient = 1 440, Remainder = 3

15. (4 marks)

Working: Method 1: Assumption Assume all 48 are chickens $\to$ $48 \times 2 = 96$ legs. Extra legs = $136 - 96 = 40$ . Each cow has 2 extra legs compared to a chicken. Number of cows = $40 \div 2 = 20$ .

Method 2: Algebra $C + W = 48 \to C = 48 - W$ $2C + 4W = 136$ $2(48 - W) + 4W = 136$ $96 - 2W + 4W = 136$ $2W = 40$ $W = 20$

Ans: 20 cows

Marking Guide:

Section A: 1 mark per correct answer.
Section B: 2 marks per correct answer. Deduct 1 mark for missing units or incorrect units where applicable. Award 1 mark for correct method with calculation error.
Section C: 4 marks per question. Award method marks for correct steps (e.g., 1 mark per correct step). Deduct marks for missing statements or units.