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Primary 5 Mathematics Whole Numbers Quiz

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Questions

Primary 5 Mathematics Quiz - Whole Numbers

Name: ________________________
Class: Primary 5 ______
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 marks)

Questions 1 to 5 carry 2 marks each. Choose the correct answer and write its number (1, 2, 3 or 4) in the brackets provided.

In the number 4 728 593, the digit 7 stands for ________.
(1) 700 000
(2) 70 000
(3) 7 000
(4) 700
Answer: (____)
Round off 3 849 267 to the nearest ten thousand.
(1) 3 800 000
(2) 3 840 000
(3) 3 850 000
(4) 3 900 000
Answer: (______)
Which of the following is the same as 6 000 000 + 400 000 + 20 000 + 5 000 + 300 + 80 + 9?
(1) 6 425 389
(2) 6 425 839
(3) 6 452 389
(4) 6 542 389
Answer: (______)
Find the value of 72 000 ÷ 800.
(1) 9
(2) 90
(3) 900
(4) 9 000
Answer: (______)
A factory produced 2 450 000 toys in January. In February, it produced 380 000 fewer toys than in January. How many toys did the factory produce in February?
(1) 2 070 000
(2) 2 130 000
(3) 2 730 000
(4) 2 830 000
Answer: (______)

Section B: Short Answer Questions (20 marks)

Questions 6 to 15 carry 2 marks each. Show your working clearly and write your answers in the spaces provided.

Write 8 050 406 in words.
Arrange the following numbers from the smallest to the greatest.
5 098 762, 5 908 762, 5 089 762, 5 980 762
Find the value of 4 500 × 60.
Find the value of 8 400 000 ÷ 700.
Complete the number pattern.
2 500 000, 2 450 000, 2 400 000, __________, 2 300 000
A library has 3 456 789 books. 1 234 567 books are fiction. The rest are non-fiction. How many non-fiction books are there?
Mr Tan had $15 000. He bought a television set for$ 3 850 and a refrigerator for $2 490. How much money had he left?
There are 480 pages in a book. Ali reads 40 pages each day. How many days will he take to finish reading the book?
The sum of two numbers is 1 200 000. The smaller number is 350 000. What is the greater number?
A machine can pack 250 boxes of chocolates in 1 hour. How many boxes can it pack in 8 hours?

Section C: Long Answer Questions (20 marks)

Questions 16 to 20 carry 4 marks each. Show your working clearly and write your answers in the spaces provided.

A stadium has 45 000 seats. On Saturday, 38 750 seats were occupied. On Sunday, 5 200 more seats were occupied than on Saturday.
(a) How many seats were occupied on Sunday?
(b) How many seats were not occupied on Sunday?

Working:
(a) _________________________________________________________________________
(b) _________________________________________________________________________
A factory produced 12 500 toys in January. In February, it produced 3 200 more toys than in January. In March, it produced twice as many toys as in February. How many toys did the factory produce in the three months altogether?

Working:
Mrs Lim had some money. She spent $4 800 on a sofa set and$ 1 250 on a coffee table. She then gave the remaining money equally to her 3 children. Each child received $2 650. How much money did Mrs Lim have at first?

Working:
There are 3 600 pupils in a school. 2/3 of them are boys. 1/4 of the boys wear spectacles. How many boys do not wear spectacles?

Working:
A container can hold 5 000 ml of water. It is filled with 3 750 ml of water. Water is then poured into the container from a tap at a rate of 250 ml per minute. How many minutes will it take to fill the container completely?

Working:

Answers

Primary 5 Mathematics Quiz - Whole Numbers (Answer Key)

Total Marks: 50

Section A: Multiple Choice Questions (10 marks)

1. Answer: (1) 700 000 [2 marks]

Key concept: Identify the place value of each digit in a large number (up to 10 million).

2. Answer: (3) 3 850 000 [2 marks]

Working/Explanation:
To round off to the nearest ten thousand, look at the thousands digit.
Number: 3 849 267
Ten thousands digit = 4
Thousands digit = 9 (which is ≥ 5)
→ Round up the ten thousands digit from 4 to 5.
All digits to the right become 0.
Result: 3 850 000.

Common mistake: Rounding to the nearest hundred thousand (3 800 000) or million (4 000 000).

3. Answer: (1) 6 425 389 [2 marks]

Working/Explanation:
Add the place values:
6 000 000

400 000
20 000
5 000
300
80
9
= 6 425 389

Key concept: Converting expanded form to standard numeral by aligning place values.

4. Answer: (2) 90 [2 marks]

Working/Explanation:
72 000 ÷ 800
= (72 000 ÷ 100) ÷ 8 (divide by 100 first, then by 8)
= 720 ÷ 8
= 90

Alternative: Cancel zeros: 72 000 ÷ 800 = 720 ÷ 8 = 90.
Key concept: Division by multiples of 10, 100, 1000 — cancel common zeros.

5. Answer: (1) 2 070 000 [2 marks]

Working/Explanation:
January production = 2 450 000
February production = 2 450 000 − 380 000
= 2 070 000

Key concept: "Fewer than" means subtraction. Align place values when subtracting large numbers.

Section B: Short Answer Questions (20 marks)

6. Answer: Eight million fifty thousand four hundred and six [2 marks]

Explanation:
8 050 406
= 8 000 000 + 50 000 + 400 + 6
Read in groups of three digits from right:
8 (million) | 050 (thousand) | 406
→ "Eight million fifty thousand four hundred and six"

Note: "Fifty thousand" not "five ten-thousands"; "and" before the last two digits (tens and ones).

7. Answer: 5 089 762, 5 098 762, 5 908 762, 5 980 762 [2 marks]

Working/Explanation:
Compare digit by digit from the left (millions → hundred thousands → ten thousands…):
All have 5 million.
Compare hundred thousands: 0, 0, 9, 9 → 0 < 9
For the two with 0 hundred thousands: compare ten thousands: 8 vs 9 → 5 089 762 < 5 098 762
For the two with 9 hundred thousands: compare ten thousands: 0 vs 8 → 5 908 762 < 5 980 762
Order: 5 089 762 < 5 098 762 < 5 908 762 < 5 980 762

8. Answer: 270 000 [2 marks]

Working:
4 500 × 60
= 4 500 × 6 × 10
= 27 000 × 10
= 270 000

Alternative: 45 × 6 = 270, then add 4 zeros (two from 4500, one from 60) → 270 000.
Key concept: Multiplication by multiples of 10 — multiply the non-zero digits, then add the total number of zeros.

9. Answer: 12 000 [2 marks]

Working:
8 400 000 ÷ 700
= (8 400 000 ÷ 100) ÷ 7
= 84 000 ÷ 7
= 12 000

Alternative: Cancel two zeros from both numbers: 84 000 ÷ 7 = 12 000.
Key concept: Division by multiples of 100 — cancel zeros, then divide.

10. Answer: 2 350 000 [2 marks]

Working/Explanation:
Pattern decreases by 50 000 each step:
2 500 000 → 2 450 000 (−50 000) → 2 400 000 (−50 000) → 2 350 000 (−50 000) → 2 300 000 (−50 000)
Missing number = 2 400 000 − 50 000 = 2 350 000

11. Answer: 2 222 222 [2 marks]

Working:
Total books = 3 456 789
Fiction books = 1 234 567
Non-fiction books = 3 456 789 − 1 234 567
= 2 222 222

Check: 2 222 222 + 1 234 567 = 3 456 789 ✓

12. Answer: $8 660 [2 marks]

Working:
Total spent = $3 850 +$ 2 490 = $6 340 Money left =$ 15 000 − $6 340 = **$ 8 660**

Alternative: $15 000 −$ 3 850 = $11 150;$ 11 150 − $2 490 =$ 8 660.

13. Answer: 12 days [2 marks]

Working:
Total pages = 480
Pages per day = 40
Number of days = 480 ÷ 40 = 12 days

Key concept: Division to find number of groups (days) when total and group size are known.

14. Answer: 850 000 [2 marks]

Working:
Sum = 1 200 000
Smaller number = 350 000
Greater number = 1 200 000 − 350 000 = 850 000

Check: 350 000 + 850 000 = 1 200 000 ✓

15. Answer: 2 000 boxes [2 marks]

Working:
Boxes per hour = 250
Hours = 8
Total boxes = 250 × 8 = 2 000 boxes

Section C: Long Answer Questions (20 marks)

16. [4 marks]

(a) 43 950 seats
(b) 1 050 seats

Working:
(a) Seats occupied on Saturday = 38 750
Seats occupied on Sunday = 38 750 + 5 200 = 43 950

(b) Total seats = 45 000
Seats not occupied on Sunday = 45 000 − 43 950 = 1 050

Mark breakdown:

(a) Correct addition: 1 mark
(b) Correct subtraction using (a): 1 mark
Correct answers with units: 2 marks

17. [4 marks]

Answer: 63 100 toys

Working:
January = 12 500
February = 12 500 + 3 200 = 15 700
March = 15 700 × 2 = 31 400
Total = 12 500 + 15 700 + 31 400 = 59 600

Wait — recalculation:
12 500 + 15 700 = 28 200
28 200 + 31 400 = 59 600

Correction: The correct total is 59 600 toys.

Mark breakdown:

February production correct: 1 mark
March production correct: 1 mark
Total correct: 1 mark
Final answer with unit: 1 mark

Common mistake: Forgetting to add January, or miscalculating March as 2 × January instead of 2 × February.

18. [4 marks]

Answer: $14 700

Working:
Money given to 3 children = $2 650 × 3 =$ 7 950
Money spent = $4 800 +$ 1 250 = $6 050 Money at first =$ 7 950 + $6 050 = **$ 14 700**

Alternative (working backwards):
Each child got $2 650 → Total remaining =$ 7 950
Add back spending: $7 950 +$ 4 800 + $1 250 =$ 14 700

Mark breakdown:

Total given to children correct: 1 mark
Total spent correct: 1 mark
Initial amount correct: 1 mark
Final answer with unit: 1 mark

19. [4 marks]

Answer: 1 800 boys

Working:
Total pupils = 3 600
Number of boys = 2/3 × 3 600 = 2 400
Boys wearing spectacles = 1/4 × 2 400 = 600
Boys not wearing spectacles = 2 400 − 600 = 1 800

Alternative (fraction method):
Fraction of boys not wearing spectacles = 1 − 1/4 = 3/4
Boys not wearing spectacles = 3/4 × 2 400 = 1 800

Mark breakdown:

Number of boys correct: 1 mark
Boys with spectacles correct: 1 mark
Boys without spectacles correct: 1 mark
Final answer with unit: 1 mark

Key concept: "Of" means multiplication. Multi-step fraction word problem.

20. [4 marks]

Answer: 5 minutes

Working:
Capacity of container = 5 000 ml
Current water = 3 750 ml
Water needed to fill = 5 000 − 3 750 = 1 250 ml
Rate = 250 ml per minute
Time needed = 1 250 ÷ 250 = 5 minutes

Mark breakdown:

Water needed correct: 1 mark
Division set up correct: 1 mark
Time calculated correct: 1 mark
Final answer with unit: 1 mark

Key concept: Rate problems — find quantity needed, then divide by rate to get time.