Primary 3 Mathematics Whole Numbers Quiz

P3 Maths Quiz: Whole Numbers - Answer Key

Total Marks: 40

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Section A: Multiple Choice Questions (10 marks)

1. In the number 5847, which digit is in the hundreds place? (2 marks)

Answer: 2 (digit 8)

Explanation: In 5847, the place values are:

• 5 = thousands place
• 8 = hundreds place ← Correct answer
• 4 = tens place
• 7 = ones place

Common mistake: Students often count from right to left incorrectly.

2. What is the value of the digit 6 in the number 6250? (2 marks)

Answer: 4 (6000)

Explanation: The digit 6 is in the thousands place, so its value is 6 × 1000 = 6000.

Common mistake: Choosing "6" (the digit itself) instead of its place value.

3. Which number is greater than 4567? (2 marks)

Answer: 2 (4576)

Working: Compare each option with 4567:

• 4556 < 4567 ✗
• 4576 > 4567 ✓ (Correct)
• 4465 < 4567 ✗
• 4655 > 4567 but wait... 4655 has 6 in hundreds place vs 5 in 4567, so 4655 > 4567 ✓

Note: Both 4576 and 4655 are greater than 4567, but 4576 is option 2.

4. Round 3748 to the nearest hundred. (2 marks)

Answer: 3 (3800)

Working:

• Look at tens digit: 4
• Since 4 < 5, round down
• 3748 rounds to 3700... wait, let me recalculate
• 3748: the tens digit is 4, so round down to 3700
• Actually, checking again: 3748, look at tens place (4), since 4 < 5, round down
• 3748 → 3700

Correction: Answer should be 1 (3700)

Method: When rounding to nearest hundred, look at the tens digit. If ≥5, round up; if <5, round down.

5. What is the missing number in this pattern? (2 marks)

Answer: 3 (1400)

Working:

• 1250 → 1300 (difference of +50)
• 1300 → 1350 (difference of +50)
• 1350 → ? (should be +50)
• 1350 + 50 = 1400
• Check: 1400 → 1450 (+50) ✓

Pattern: Adding 50 each time

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Section B: Short Answer Questions (15 marks)

6. Write the following number in words: (3 marks) 7039

Answer: Seven thousand and thirty-nine

Alternative acceptable: Seven thousand, thirty-nine

Method:

• 7000 = seven thousand
• 039 = thirty-nine (not "zero hundred thirty-nine")

Common mistake: Including "zero hundred" in the middle

7. Arrange these numbers in descending order: (3 marks) 2856, 2865, 2586, 2658

Answer: 2865, 2856, 2658, 2586

Working: All start with 2, so compare hundreds place:

• 2865 (8 hundreds) - largest
• 2856 (8 hundreds, but 5 tens vs 6 tens in 2865)
• 2658 (6 hundreds)
• 2586 (5 hundreds) - smallest

Method: Compare place values from left to right

8. Complete the number line: (3 marks)

Answer: 2500

Working:

• Distance from 2400 to 2600 = 200
• Middle point = 2400 + 100 = 2500
• Or: (2400 + 2600) ÷ 2 = 5000 ÷ 2 = 2500

Common mistake: Not finding the exact midpoint

9. What is 5926 rounded to the nearest 10? (3 marks)

Answer: 5930

Working:

• Look at ones digit: 6
• Since 6 ≥ 5, round up
• 5926 → 5930

Method: When rounding to nearest 10, look at ones digit

10. Find the missing number: (3 marks)

**Answer: 4785**

**Working:** 4685 + 100 = 4785

**Common mistake:** Adding 10 instead of 100

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Section C: Word Problems (15 marks)

11. Library books comparison: (4 marks)

Answer: Tuesday had 279 more books.

Working:

• Monday: 2847 books
• Tuesday: 3126 books
• Compare: 3126 > 2847, so Tuesday had more
• Difference: 3126 - 2847 = 279 books

Mark allocation:

• Identify which day (1 mark)
• Correct subtraction setup (1 mark)
• Correct calculation (2 marks)

12. Toy production pattern: (4 marks)

Answer: 2250 toys

Working:

• January: 1250
• February: 1500 (+250)
• March: 1750 (+250)
• Pattern: increase by 250 each month
• April: 1750 + 250 = 2000
• May: 2000 + 250 = 2250

Mark allocation:

• Identify pattern (+250 each month) (2 marks)
• Calculate April correctly (1 mark)
• Calculate May correctly (1 mark)

Alternative method: Arithmetic sequence with first term a=1250, difference d=250

• May is 5th term: a + 4d = 1250 + 4(250) = 1250 + 1000 = 2250

13. Stamp collection problem: (4 marks)

Answer: 4325 stamps

Working:

• Ali starts with: 4675 stamps
• Ali gives away: 350 stamps
• Ali has left: 4675 - 350 = 4325 stamps

Mark allocation:

• Identify correct operation (subtraction) (1 mark)
• Set up: 4675 - 350 (1 mark)
• Correct calculation (2 marks)

Common mistake: Adding instead of subtracting, or calculating what Ben has

14. Rounding and reverse problems: (3 marks)

Answer: Report shows 1800 students. Two possible numbers: 1796 and 1834 (or any numbers from 1750-1849)

Working:

• 1846 rounded to nearest hundred:
• Look at tens digit: 4
• Since 4 < 5, round down: 1846 → 1800

Possible original numbers that round to 1800:

• Any number from 1750 to 1849
• Examples: 1750, 1760, 1796, 1834, 1849

Mark allocation:

• Correct rounding (1 mark)
• Two valid original numbers (2 marks)

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Common Mistakes to Watch For

1. Place value confusion: Mixing up digit vs. digit value
2. Rounding errors: Looking at wrong digit or rounding wrong direction
3. Pattern recognition: Not identifying the constant difference
4. Word problems: Choosing wrong operation (+ instead of -)
5. Number ordering: Not comparing systematically from left to right

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Alternative Methods

For comparing numbers: Use place value chart

Thousands | Hundreds | Tens | Ones
    2     |    8     |  5   |  6
    2     |    8     |  6   |  5

For rounding: Use number line visualization

3700 ──── 3748 ──── 3800
          ↑ closer to 3700

For patterns: Make a table

Position	Value	Difference
1st	1250	-
2nd	1300	+50
3rd	1350	+50

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Extension Activities

1. Create your own 4-digit numbers and identify place values
2. Practice rounding to different place values (tens, hundreds, thousands)
3. Find number patterns in real life (house numbers, page numbers)
4. Compare prices or quantities using greater than/less than

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Answer key developed based on actual P3 exam question analysis and MOE syllabus requirements