Primary 3 Mathematics Whole Numbers Quiz

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Primary 3 Mathematics Quiz - Whole Numbers

Name: _________________________________ Class: __________ Date: __________

Duration: 40 minutes

Total Marks: 30 marks

Instructions:

• Answer all questions.
• Show your working clearly for all questions.
• Write your answers in the spaces provided.

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Section A: Multiple Choice (Questions 1–5)

Choose the correct answer. Each question carries 1 mark.

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1. In the number 8,432, which digit is in the hundreds place?

A) 8
B) 4
C) 3
D) 2

Answer: __________ (1 mark)

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2. What is the value of the digit 7 in 7,056?

A) 7
B) 70
C) 700
D) 7,000

Answer: __________ (1 mark)

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3. Which of the following numbers is the largest?

A) 6,789
B) 6,879
C) 6,798
D) 6,987

Answer: __________ (1 mark)

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4. Which number is 2,000 more than 4,568?

A) 4,570
B) 4,768
C) 6,568
D) 24,568

Answer: __________ (1 mark)

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5. 5 thousands, 3 hundreds, 8 tens and 7 ones = _______

A) 5,387
B) 5,378
C) 5,837
D) 5,738

Answer: __________ (1 mark)

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Section B: Short Answer (Questions 6–15)

Answer all questions. Show your working clearly.

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6. Write 6,090 in words.

(1 mark)

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7. Write "four thousand and fifty-six" in numerals.

(1 mark)

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8. What is the value of the digit 9 in 9,240?

(1 mark)

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9. Arrange these numbers in ascending order: 3,456, 3,654, 3,465, 3,645

(2 marks)

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10. (a) In 6,728, the digit 6 stands for _________________________.

(b) In 6,728, the digit 7 is in the _________________________ place.

(2 marks)

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11. Find the sum of 2,345 and 4,567.

(2 marks)

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12. Subtract 1,876 from 5,000.

(2 marks)

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13. A number, when rounded to the nearest hundred, is 4,700.

(a) What is the smallest possible number?

(1 mark)

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(b) What is the largest possible number?

(1 mark)

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14. Form the smallest 4-digit number using the digits 5, 2, 8, and 3. Each digit can be used only once.

(2 marks)

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15. Complete the number pattern: 2,450, 2,500, 2,550, _______, 2,650

(2 marks)

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Section C: Problem Solving (Questions 16–20)

Show all your working clearly. Each question carries 2 marks unless stated.

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16. Mrs. Tan has 3,456 stickers. She gives away 1,278 stickers to her class. How many stickers does she have left?

(2 marks)

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17. A warehouse has 2,345 boxes of books. Another 1,876 boxes are delivered. How many boxes are there in the warehouse altogether?

(2 marks)

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18. John has 1,250 stamps. Peter has 876 more stamps than John. How many stamps does Peter have?

(2 marks)

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19. A school has 4,500 books in its library. During a book fair, 2,345 books are borrowed and 1,234 new books are donated. How many books are in the library now?

(3 marks)

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20. (a) Write down all the 4-digit numbers that can be formed using the digits 1, 0, 2, and 3, where the thousands digit is 2. Each digit can be used only once in each number.

(2 marks)

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(b) Arrange the numbers you found in part (a) in descending order.

(1 mark)

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END OF QUIZ

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Primary 3 Mathematics Quiz - Whole Numbers: Answer Key

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Section A: Multiple Choice (Questions 1–5)

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1. In the number 8,432, which digit is in the hundreds place?

Answer: B) 4

Working and Explanation: In a 4-digit number, the places from left to right are: thousands, hundreds, tens, ones.

Thousands	Hundreds	Tens	Ones
8	4	3	2

The digit 4 is in the hundreds place. Its value is 400.

Common Mistake: Students sometimes confuse "digit" with "value." The digit is 4; the value is 400.

(1 mark)

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2. What is the value of the digit 7 in 7,056?

Answer: D) 7,000

Working and Explanation: The digit 7 is in the thousands place.

Thousands	Hundreds	Tens	Ones
7	0	5	6

Value of digit 7 = $7 \times 1,000 = 7,000$

Key Concept: The "value of a digit" = digit $\times$ place value of its position.

Common Mistake: Choosing A) 7 (the digit itself, not its value).

(1 mark)

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3. Which of the following numbers is the largest?

Answer: D) 6,987

Working and Explanation: Compare place values from left to right (thousands first, then hundreds, etc.):

• All have 6 in the thousands place: compare hundreds
• A) 6,789: 7 hundreds
• B) 6,879: 8 hundreds
• C) 6,798: 7 hundreds
• D) 6,987: 9 hundreds

$9 > 8 > 7$, so 6,987 is largest.

Method: Compare digits from left to right until you find a difference.

(1 mark)

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4. Which number is 2,000 more than 4,568?

Answer: C) 6,568

Working and Explanation: "2,000 more than" means add 2,000:

$4,568 + 2,000 = 6,568$

The thousands digit increases by 2: $4 \rightarrow 6$.

Common Mistake: Adding 2 instead of 2,000, getting 4,570 (Option A).

(1 mark)

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5. 5 thousands, 3 hundreds, 8 tens and 7 ones = _______

Answer: A) 5,387

Working and Explanation: Build the number step by step:

Place	Value	Numeral
5 thousands	$5 \times 1,000 = 5,000$	5
3 hundreds	$3 \times 100 = 300$	3
8 tens	$8 \times 10 = 80$	8
7 ones	$7 \times 1 = 7$	7

Total: $5,000 + 300 + 80 + 7 = 5,387$

(1 mark)

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Section B: Short Answer (Questions 6–15)

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6. Write 6,090 in words.

Answer: Six thousand and ninety

Working and Explanation: Break down: $6,000 + 90$

• 6 in thousands place → "six thousand"
• 0 in hundreds place → nothing to say (but we need "and" before tens when hundreds is zero in standard Singapore format, or simply "six thousand ninety")
• 9 in tens place, 0 in ones place → "ninety"

Note: In Singapore primary schools, "six thousand and ninety" is accepted. Some schools accept "six thousand ninety."

Marking: Accept "Six thousand and ninety" or "Six thousand ninety."

(1 mark)

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7. Write "four thousand and fifty-six" in numerals.

Answer: 4,056

Working and Explanation:

Words	Digit Placement
four thousand	4 in thousands place
(no hundreds mentioned)	0 in hundreds place
fifty	5 in tens place
six	6 in ones place

Build: 4 0 5 6 → 4,056

Common Mistake: Writing 4,506 (swapping tens and ones) or 4,560 (adding extra zero).

(1 mark)

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8. What is the value of the digit 9 in 9,240?

Answer: 9,000 (or 9 thousands)

Working and Explanation: The digit 9 is in the thousands place.

$9 \times 1,000 = 9,000$

(1 mark)

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9. Arrange these numbers in ascending order: 3,456, 3,654, 3,465, 3,645

Answer: 3,456, 3,465, 3,645, 3,654

Working and Explanation: All start with 3,456__ so compare hundreds, then tens, then ones:

Number	Hundreds	Tens	Ones
3,456	4	5	6
3,654	6	5	4
3,465	4	6	5
3,645	6	4	5

First group by hundreds digit:

• Hundreds = 4: 3,456 and 3,465
  • Compare tens: 5 < 6, so 3,456 < 3,465
• Hundreds = 6: 3,645 and 3,654
  • Compare tens: 4 < 5, so 3,645 < 3,654

Ascending order (smallest to largest): 3,456 → 3,465 → 3,645 → 3,654

Marking: 2 marks for fully correct order. Award 1 mark if three numbers are in correct relative order (partial credit).

(2 marks)

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10. (a) In 6,728, the digit 6 stands for _________________________.

(b) In 6,728, the digit 7 is in the _________________________ place.

Answer: (a) 6,000 / 6 thousands; (b) hundreds

Working and Explanation:

Digit	Position	Value
6	thousands	$6 \times 1,000 = 6,000$
7	hundreds	$7 \times 100 = 700$
2	tens	$2 \times 10 = 20$
8	ones	$8 \times 1 = 8$

(a) "Stands for" asks for the value of the digit, not just the digit itself.

(b) The digit 7 is in the hundreds place.

Marking: 1 mark each.

(2 marks)

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11. Find the sum of 2,345 and 4,567.

Answer: 6,912

Working and Explanation: Use standard addition algorithm, aligning by place value:

  2 3 4 5
+ 4 5 6 7
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Step-by-step:

• Ones: $5 + 7 = 12$ → write 2, carry 1 to tens
• Tens: $4 + 6 + 1 = 11$ → write 1, carry 1 to hundreds
• Hundreds: $3 + 5 + 1 = 9$ → write 9
• Thousands: $2 + 4 = 6$ → write 6

Answer: 6,912

Check: $6,912 - 4,567 = 2,345$ ✓

(2 marks)

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12. Subtract 1,876 from 5,000.

Answer: 3,124

Working and Explanation: Use standard subtraction algorithm:

  5 0 0 0
- 1 8 7 6
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Step-by-step (with regrouping):

• Ones: $0 - 6$ → need to regroup. From tens: but tens is 0. From hundreds: but hundreds is 0. From thousands.
• Thousands: 5 → 4, hundreds: 0 → 10, then hundreds: 10 → 9, tens: 0 → 10, then tens: 10 → 9, ones: 0 → 10
• Ones: $10 - 6 = 4$
• Tens: $9 - 7 = 2$
• Hundreds: $9 - 8 = 1$
• Thousands: $4 - 1 = 3$

Answer: 3,124

Alternative check: $3,124 + 1,876 = 5,000$ ✓

(2 marks)

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13. A number, when rounded to the nearest hundred, is 4,700.

(a) What is the smallest possible number?

Answer: 4,650

Working and Explanation: Rounding to nearest hundred depends on the tens digit:

• If tens digit is 0–4, round down
• If tens digit is 5–9, round up

For a number to round up to 4,700: it must be in range 4,650 to 4,699

For a number to round down to 4,700: impossible (would round to 4,700 only from below if exactly 4,700 or rounding up to it)

Actually: numbers that round to 4,700 are: 4,650 to 4,749

Wait—let me reconsider. Standard rounding: 4,650 to 4,749 round to 4,700? No.

Correct analysis:

• 4,650 to 4,699: the midpoint is 4,650.
• Actually for rounding to nearest hundred: 4,650 rounds up to 4,700 (standard rounding: 5 rounds up).
• 4,649 rounds down to 4,600.
• 4,749 rounds up to 4,700? No, 4,749: tens digit is 4, so rounds down to 4,700? No wait.

Let me be precise: Look at tens and ones together.

• 4,700 rounded to nearest hundred: numbers from 4,650 to 4,749 inclusive round to 4,700.

Wait no—standard "round half up":

• If the number is exactly halfway or above the lower hundred, round up.
• 4,650 is exactly halfway between 4,600 and 4,700 → rounds up to 4,700.
• 4,649 rounds down to 4,600.
• 4,749: the next hundred is 4,800. Is 4,749 closer to 4,700 or 4,800? Distance to 4,700 is 49; to 4,800 is 51. So 4,749 rounds to 4,700.

Actually rethinking: The boundary is at the midpoint. Numbers from 4,650 to 4,749 round to 4,700? Let's verify:

• 4,749: tens digit is 4, ones is 9. Looking at "tens and ones" as 49, which is less than 50... no that's not right either.

Correct method for rounding to nearest hundred: Look at the tens digit:

• If tens digit is 0, 1, 2, 3, 4: round down (keep hundreds digit, change rest to 0)
• If tens digit is 5, 6, 7, 8, 9: round up (increase hundreds digit by 1, change rest to 0)

So:

• 4,649: tens digit is 4 → rounds to 4,600
• 4,650: tens digit is 5 → rounds to 4,700
• 4,749: tens digit is 4 → rounds to 4,700
• 4,750: tens digit is 5 → rounds to 4,800

So numbers rounding to 4,700: 4,650 to 4,749

(a) Smallest: 4,650

(b) Largest: 4,749

Common Mistake: Thinking the range is 4,700 ± 50, giving 4,650 to 4,750. But 4,750 rounds to 4,800.

(2 marks total: 1 mark each)

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14. Form the smallest 4-digit number using the digits 5, 2, 8, and 3. Each digit can be used only once.

Answer: 2,358

Working and Explanation: To form the smallest number:

1. Place the smallest non-zero digit in the thousands place (can't be 0, and we need a 4-digit number)
2. Arrange remaining digits in ascending order from left to right

Digits available: 2, 3, 5, 8

Position	Logic	Digit
Thousands	Smallest digit	2
Hundreds	Next smallest of remaining	3
Tens	Next smallest	5
Ones	Largest	8

Answer: 2,358

Common Mistake: Putting digits in ascending order as 2, 3, 5, 8 but perhaps starting with 0 if 0 were available. Since no 0, straightforward.

(2 marks)

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15. Complete the number pattern: 2,450, 2,500, 2,550, _______, 2,650

Answer: 2,600

Working and Explanation: Find the difference between consecutive terms:

Step	Calculation	Result
2,500 − 2,450		50
2,550 − 2,500		50

Common difference = 50 (adding 50 each time)

Next term: $2,550 + 50 = 2,600$

Verify: $2,600 + 50 = 2,650$ ✓ (matches given last term)

Pattern rule: Start at 2,450, add 50 each time.

(2 marks)

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Section C: Problem Solving (Questions 16–20)

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16. Mrs. Tan has 3,456 stickers. She gives away 1,278 stickers to her class. How many stickers does she have left?

Answer: 2,178 stickers

Working and Explanation: This is a take away / subtraction problem.

Keywords: "gives away" means subtract.

  3 4 5 6
- 1 2 7 8
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Step-by-step with regrouping:

• Ones: $6 - 8$ → need regroup. Tens: 5 → 4, ones: 6 → 16. Then $16 - 8 = 8$
• Tens: $4 - 7$ → need regroup. Hundreds: 4 → 3, tens: 4 → 14. Then $14 - 7 = 7$
• Hundreds: $3 - 2 = 1$
• Thousands: $3 - 1 = 2$

Answer: 2,178 stickers

Check: $2,178 + 1,278 = 3,456$ ✓

(2 marks)

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17. A warehouse has 2,345 boxes of books. Another 1,876 boxes are delivered. How many boxes are there in the warehouse altogether?

Answer: 4,221 boxes

Working and Explanation: Keywords: "altogether" means addition.

$2,345 + 1,876 = ?$

  2 3 4 5
+ 1 8 7 6
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• Ones: $5 + 6 = 11$ → write 1, carry 1
• Tens: $4 + 7 + 1 = 12$ → write 2, carry 1
• Hundreds: $3 + 8 + 1 = 12$ → write 2, carry 1
• Thousands: $2 + 1 + 1 = 4$

Answer: 4,221 boxes

(2 marks)

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18. John has 1,250 stamps. Peter has 876 more stamps than John. How many stamps does Peter have?

Answer: 2,126 stamps

Working and Explanation: Keywords: "more than" means addition.

Peter's stamps = John's stamps + 876

$1,250 + 876 = ?$

  1 2 5 0
+   8 7 6
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  2 1 2 6

• Ones: $0 + 6 = 6$
• Tens: $5 + 7 = 12$ → write 2, carry 1
• Hundreds: $2 + 8 + 1 = 11$ → write 1, carry 1
• Thousands: $1 + 0 + 1 = 2$

Answer: 2,126 stamps

Common Mistake: Subtracting 876 instead of adding, misreading "more than."

(2 marks)

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19. A school has 4,500 books in its library. During a book fair, 2,345 books are borrowed and 1,234 new books are donated. How many books are in the library now?

Answer: 3,389 books

Working and Explanation: This is a two-step problem:

Step 1: Books borrowed → subtract $4,500 - 2,345 = 2,155$

  4 5 0 0
- 2 3 4 5
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  2 1 5 5

Step 2: New books donated → add $2,155 + 1,234 = 3,389$

  2 1 5 5
+ 1 2 3 4
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  3 3 8 9

Answer: 3,389 books

Marking breakdown:

• Correct method with one arithmetic error: 2 marks
• Correct final answer with clear working: 3 marks
• Correct answer only, no working: 1 mark (method mark deducted)

(3 marks)

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20. (a) Write down all the 4-digit numbers that can be formed using the digits 1, 0, 2, and 3, where the thousands digit is 2. Each digit can be used only once in each number.

Answer: 2,013; 2,031; 2,103; 2,130; 2,301; 2,310

Working and Explanation: Thousands digit is fixed as 2.

Remaining digits to arrange in hundreds, tens, ones places: 0, 1, 3

Systematic listing using remaining digits (0, 1, 3):

Hundreds	Tens	Ones	Number
0	1	3	2,013
0	3	1	2,031
1	0	3	2,103
1	3	0	2,130
3	0	1	2,301
3	1	0	2,310

There are $3! = 3 \times 2 \times 1 = 6$ arrangements.

Note: 0 can be in hundreds place (it becomes a 3-digit-looking part but the number is still 4-digit because thousands digit is 2).

Marking: 1 mark for systematic approach shown, 1 mark for all 6 correct numbers.

(2 marks)

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(b) Arrange the numbers you found in part (a) in descending order.

Answer: 2,310; 2,301; 2,130; 2,103; 2,031; 2,013

Working and Explanation: Compare from left to right (all have 2 in thousands, so compare hundreds):

Number	Hundreds	Comparison
2,310	3	largest
2,301	3	next (tens 0 < 1)
2,130	1
2,103	1	(tens 0 < 3)
2,031	0
2,013	0	smallest

Order: 2,310 > 2,301 > 2,130 > 2,103 > 2,031 > 2,013

(1 mark)

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Total Marks: 30 marks