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Primary 3 Mathematics Practice Paper 4
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TuitionGoWhere Practice Paper — Answer Key
Mathematics Primary 3 | Whole Numbers | Version 4 of 5
Section A: Multiple Choice (10 marks)
1. What is the value of the digit 6 in the number 6,342?
- Answer: D (6,000)
- The digit 6 is in the thousands place. Value = 6 × 1,000 = 6,000.
- Common mistake: Choosing A (6) — this is the digit itself, not its value.
2. Which digit is in the hundreds place in the number 8,573?
- Answer: B (5)
- Place values in 8,573: 8 (thousands), 5 (hundreds), 7 (tens), 3 (ones).
3. "Four thousand, two hundred and five" in numerals.
- Answer: C (4,205)
- 4,000 + 200 + 5 = 4,205. Note: there are no tens, so a 0 goes in the tens place.
- Common mistake: Choosing B (4,025) — this swaps the tens and ones digits.
4. Which is the smallest number?
- Answer: D (3,124)
- Compare digit by digit from the left: all start with 3. In the hundreds place: 1 < 2 < 4, so 3,124 is smallest.
5. Round 4,678 to the nearest hundred.
- Answer: C (4,700)
- The tens digit is 7 (≥ 5), so round up: 4,678 → 4,700.
6. Which number is even?
- Answer: D (5,842)
- An even number ends in 0, 2, 4, 6, or 8. Only 5,842 ends in an even digit.
7. What is 1,000 more than 5,329?
- Answer: B (6,329)
- 5,329 + 1,000 = 6,329. Add 1 to the thousands digit.
8. Arrange in ascending order: 7,205; 7,025; 7,502; 7,052
- Answer: A (7,025; 7,052; 7,205; 7,502)
- Compare hundreds place: 0 < 0 < 2 < 5. For 7,025 and 7,052 (both have 0 hundreds), compare tens: 2 < 5, so 7,025 < 7,052.
9. In 9,080, the digit 8 is in the __________ place.
- Answer: B (tens)
- Place values: 9 (thousands), 0 (hundreds), 8 (tens), 0 (ones).
10. Which number is closest to 6,000?
- Answer: C (5,999)
- Find the difference from 6,000: A = 110, B = 105, C = 1, D = 250. The smallest difference is 1.
Section B: Short Answer (20 marks)
11. Write 3,506 in words.
- Answer: Three thousand, five hundred and six
- 3 (thousands) + 5 (hundreds) + 0 (tens) + 6 (ones). Note: "and" is used before the ones when there are no tens.
- Marking note: Accept "three thousand five hundred and six" without commas. Award 2 marks for correct answer, 1 mark if one part is wrong (e.g., "three thousand and six" — missing "five hundred").
12. Write "Seven thousand, eight hundred and twelve" in numerals.
- Answer: 7,812
- 7,000 + 800 + 10 + 2 = 7,812.
- Marking note: Award 2 marks for correct answer. Award 1 mark if the student writes 7,802 or 7,821 (digit transposition).
13. Fill in the blanks.
- (a) Answer: 8
- For 5,___38 > 5,738, the hundreds digit must be greater than 7. The smallest such digit is 8.
- (b) Answer: 200
- 4,261 = 4,000 + ___ + 60 + 1. The missing place is hundreds: 2 × 100 = 200.
- Marking note: 1 mark each part.
14. Use digits 2, 7, 4, 9 (each used once).
- (a) Largest: 9,742
- Arrange digits in descending order: 9, 7, 4, 2.
- (b) Smallest: 2,479
- Arrange digits in ascending order: 2, 4, 7, 9.
- Marking note: 1 mark each part. Award 0 if any digit is repeated or omitted.
15. Round to the nearest ten.
- (a) 3,457 → 3,460
- Ones digit is 7 (≥ 5), so round up the tens digit: 5 → 6.
- (b) 8,293 → 8,290
- Ones digit is 3 (< 5), so round down: keep the tens digit as 9.
- (c) 6,555 → 6,560
- Ones digit is 5 (≥ 5), so round up the tens digit: 5 → 6.
- Marking note: 1 mark each part.
16. Singapore Zoo visitors.
- (a) Answer: Tuesday
- 4,853 is the largest number.
- (b) Answer: Wednesday
- 4,128 is the smallest number.
- (c) Answer: 725 more visitors
- Working: 4,853 − 4,128 = 725
- Step-by-step: 4,853 − 4,000 = 853; 853 − 128 = 725.
- Marking note: 1 mark each for (a) and (b). For (c), award 2 marks for correct answer with working, 1 mark for correct answer without working or with minor arithmetic error.
Section C: Structured / Word Problems (10 marks)
17. School library books.
- (a) Answer: 6,254 books
- Working: 3,765 + 2,489
- Step-by-step:
- Ones: 5 + 9 = 14 → write 4, carry 1
- Tens: 6 + 8 + 1 = 15 → write 5, carry 1
- Hundreds: 7 + 4 + 1 = 12 → write 2, carry 1
- Thousands: 3 + 2 + 1 = 6
- Total: 6,254
- (b) Answer: 1,276 more storybooks
- Working: 3,765 − 2,489
- Step-by-step:
- Ones: 5 − 9 → borrow → 15 − 9 = 6
- Tens: 5 − 8 → borrow → 15 − 8 = 7
- Hundreds: 6 − 4 = 2
- Thousands: 3 − 2 = 1
- Difference: 1,276
- Marking note: (a) — 2 marks: 1 for correct method/working, 1 for correct answer. (b) — 1 mark for correct answer.
18. Charity drive.
- (a) Answer: $4,230
- Working: 1,780
- Step-by-step:
- Ones: 0 + 0 = 0
- Tens: 5 + 8 = 13 → write 3, carry 1
- Hundreds: 4 + 7 + 1 = 12 → write 2, carry 1
- Thousands: 2 + 1 + 1 = 4
- Total: $4,230
- (b) Answer: $670
- Working: 1,780
- Step-by-step:
- Ones: 0 − 0 = 0
- Tens: 5 − 8 → borrow → 15 − 8 = 7
- Hundreds: 3 − 7 → borrow → 13 − 7 = 6
- Thousands: 1 − 1 = 0
- Difference: $670
- Marking note: (a) — 2 marks: 1 for correct method/working, 1 for correct answer. (b) — 1 mark for correct answer.
19. Chicken rice plates.
- Answer: 1,470 plates
- Working:
- Total sold in first two weeks: 1,350 + 2,180 = 3,530
- Plates needed in third week: 5,000 − 3,530 = 1,470
- Step-by-step:
- 1,350 + 2,180: 1,000 + 2,000 = 3,000; 350 + 180 = 530; total = 3,530
- 5,000 − 3,530: 5,000 − 3,000 = 2,000; 2,000 − 530 = 1,470
- Marking note: Award 2 marks for correct answer with clear working. Award 1 mark for correct answer without working, or for correct method with minor arithmetic error.
20. HDB town populations.
- (a) Answer: 8,246; 8,462; 8,624; 8,642
- Compare digit by digit from the left:
- All start with 8 (thousands).
- Hundreds: 2 < 4 < 6 = 6, so 8,246 is smallest, then 8,462.
- For 8,624 and 8,642 (both have 6 hundreds): compare tens: 2 < 4, so 8,624 < 8,642.
- Compare digit by digit from the left:
- (b) Answer: Town A (8,462)
- Working:
- Town A: 8,462 → tens digit is 6 (≥ 5) → round up → 8,500 ✓
- Town B: 8,624 → rounds to 8,600
- Town C: 8,246 → rounds to 8,200
- Town D: 8,642 → rounds to 8,600
- Only Town A rounds to 8,500.
- Working:
- Marking note: 1 mark each part. For (a), award 0 if the order is not fully correct. For (b), award the mark for the correct town name; working is not required but helps confirm reasoning.
Total: 40 marks