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Primary 4 Mathematics Whole Numbers Quiz
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Primary 4 Mathematics Quiz - Whole Numbers (Answer Key)
Total Marks: 40
Section A: Multiple Choice Questions (10 × 1 mark = 10 marks)
1. Answer: (2) 8
Explanation: In 68,429, the digits from left to right are: 6 (ten thousands), 8 (thousands), 4 (hundreds), 2 (tens), 9 (ones). The digit in the thousands place is 8.
Mark: 1
2. Answer: (4) 7000
Explanation: In 57,381, the digit 7 is in the thousands place. Its value is 7 × 1,000 = 7,000.
Mark: 1
3. Answer: (1) Eighty-four thousand and six
Explanation: 84,006 = 80,000 + 4,000 + 6. In words: "Eighty-four thousand and six". Note: "and" is used before the last part when there are no hundreds or tens.
Mark: 1
4. Answer: (1) 37,600
Explanation: To round to the nearest hundred, look at the tens digit (4). Since 4 < 5, round down. 37,642 → 37,600.
Mark: 1
5. Answer: (3) 45,499
Explanation: When rounding to the nearest thousand, numbers from 44,500 to 45,499 round to 45,000.
- 44,399 rounds to 44,000 (hundreds digit 3 < 5)
- 44,501 rounds to 45,000 (hundreds digit 5 ≥ 5)
- 45,499 rounds to 45,000 (hundreds digit 4 < 5)
- 45,501 rounds to 46,000 (hundreds digit 5 ≥ 5)
Mark: 1
6. Answer: (1) 52,800, 52,500, 52,200, 51,900
Explanation: Check each option by subtracting 300 from each term:
(1) 52,800 − 300 = 52,500 ✓, 52,500 − 300 = 52,200 ✓, 52,200 − 300 = 51,900 ✓
(2) Adds 300 each time ✗
(3) Subtracts 100 each time ✗
(4) Subtracts 400 each time ✗
Mark: 1
7. Answer: (1) 55,150
Working:
62,000 + 18,450 = 80,450
80,450 − 25,300 = 55,150
Mark: 1
8. Answer: (1) 8,680
Working:
248 × 35 = 248 × (30 + 5) = 248 × 30 + 248 × 5 = 7,440 + 1,240 = 8,680
Mark: 1
9. Answer: (1) 9,963
Working:
Number = (Divisor × Quotient) + Remainder = (8 × 1,245) + 3 = 9,960 + 3 = 9,963
Mark: 1
10. Answer: (1) 15,550
Working:
February: 8,450 − 1,350 = 7,100
Total: 8,450 + 7,100 = 15,550
Mark: 1
Section B: Short Answer Questions (10 × 2 marks = 20 marks)
11. Answer: 92,407
Explanation: "Ninety-two thousand" = 92,000; "four hundred" = 400; "seven" = 7. Total = 92,000 + 400 + 7 = 92,407.
Mark: 2 (1 for correct numerals, 1 for correct place value including zero placeholder)
12. Answer: thousands ; 3,000
Explanation: In 43,815: 4 (ten thousands), 3 (thousands), 8 (hundreds), 1 (tens), 5 (ones). The digit 3 is in the thousands place. Its value = 3 × 1,000 = 3,000.
Mark: 2 (1 for correct place, 1 for correct value)
13. Answer: 28,054 ; 28,405 ; 28,450 ; 28,504
Explanation: Compare from the leftmost digit (ten thousands): all are 2. Thousands: all are 8. Hundreds: 0, 4, 4, 5. So 28,054 is smallest. For 28,405 and 28,450, compare tens: 0 < 5, so 28,405 < 28,450. Largest is 28,504.
Mark: 2 (1 for correct order, 1 for all four correct)
14. Answer: 59,880
Explanation: To round to the nearest ten, look at the ones digit (6). Since 6 ≥ 5, round up. 59,876 → 59,880.
Mark: 2 (1 for correct rounding direction, 1 for correct answer)
15. Answer: 72,349
Explanation: When rounding to the nearest hundred gives 72,300, the original number ranges from 72,250 to 72,349. The greatest possible value is 72,349.
Mark: 2 (1 for understanding range, 1 for correct maximum)
16. Answer: 62,700 ; 62,200
Explanation: Pattern decreases by 500 each time:
64,200 − 500 = 63,700
63,700 − 500 = 63,200
63,200 − 500 = 62,700
62,700 − 500 = 62,200
Mark: 2 (1 for each correct term)
17. Answer: 60,550
Working:
48,300 + 27,650 = 75,950
75,950 − 15,400 = 60,550
Mark: 2 (1 for correct addition, 1 for correct subtraction and final answer)
18. Answer: 13,272
Working:
316 × 42 = 316 × (40 + 2) = 316 × 40 + 316 × 2 = 12,640 + 632 = 13,272
Mark: 2 (1 for correct method/partial product, 1 for correct final answer)
19. Answer: 1,456
Working:
8,736 ÷ 6
8 ÷ 6 = 1 remainder 2 → bring down 7 → 27 ÷ 6 = 4 remainder 3 → bring down 3 → 33 ÷ 6 = 5 remainder 3 → bring down 6 → 36 ÷ 6 = 6
Answer: 1,456
Mark: 2 (1 for correct division steps, 1 for correct final answer)
20. Answer: 1,242
Working:
Remaining stickers = 12,500 − 3,800 = 8,700
Stickers per packet = 8,700 ÷ 7 = 1,242 remainder 6
Answer: 1,242 stickers in each packet (6 stickers left over)
Mark: 2 (1 for correct subtraction, 1 for correct division and answer)
Common Mistakes to Watch For:
- Place value confusion: "Digit in the thousands place" vs "Value of the digit in the thousands place"
- Rounding direction: Remember: 0-4 round down, 5-9 round up
- Number patterns: Always check the difference between consecutive terms
- Multi-step problems: Show all steps clearly; method marks are awarded for correct working
- Division with remainder: Remember to state the remainder if asked, or interpret it in context
- Word problems: Read carefully - "fewer than" means subtraction, "more than" means addition, "twice as many" means ×2
Marking Summary:
- Section A: 10 marks
- Section B: 20 marks
- Total: 30 marks