Primary 2 Mathematics Numbers Quiz

Primary 2 Mathematics Quiz - Numbers

Answer Key

Section A: Place Value (Questions 1–5)

1. What is the value of the digit 6 in the number 638?

Answer: 600
Marks: 2
Working: The digit 6 is in the hundreds place. So its value is 6 × 100 = 600.
Marking note: Award 2 marks for the correct answer "600". Award 0 marks for "6" (confusing digit with value).

2. Which digit is in the tens place in the number 472?

Answer: 7
Marks: 2
Working: In 472, the digits from left to right are: 4 (hundreds), 7 (tens), 2 (ones). The digit in the tens place is 7.
Marking note: Award 2 marks for "7". Award 0 marks for "70" (this is the value, not the digit).

3. Write the following in expanded form: 509

Answer: 500 + 0 + 9 (or 500 + 9)
Marks: 2
Working: 509 has 5 hundreds, 0 tens, and 9 ones. So 509 = 500 + 0 + 9.
Marking note: Award 2 marks for "500 + 0 + 9" or "500 + 9". Award 1 mark if the student writes "500 + 9" (omitting the tens is acceptable at this level).

4. Fill in the blanks: 7 hundreds + 2 tens + 3 ones = __________

Answer: 723
Marks: 2
Working: 7 hundreds = 700, 2 tens = 20, 3 ones = 3. So 700 + 20 + 3 = 723.
Marking note: Award 2 marks for "723". Award 1 mark if the student shows correct working but makes an arithmetic error.

5. What is the value of the digit 4 in the number 941?

Answer: 40
Marks: 2
Working: The digit 4 is in the tens place. So its value is 4 × 10 = 40.
Marking note: Award 2 marks for "40". Award 0 marks for "4" (confusing digit with value).

Section B: Comparing and Ordering Numbers (Questions 6–10)

6. Compare the two numbers. Write >, <, or =.

356 __________ 365

Answer: <
Marks: 2
Working: Both numbers have 3 hundreds. Compare the tens: 5 tens < 6 tens. So 356 < 365.
Marking note: Award 2 marks for "<". Award 0 marks for ">" or "=".

7. Arrange the following numbers in order from smallest to biggest.

712, 127, 271, 721

Answer: 127, 271, 712, 721
Marks: 2
Working: Compare the hundreds digit first: 127 (1 hundred), 271 (2 hundreds), 712 (7 hundreds), 721 (7 hundreds). For 712 and 721, compare the tens: 1 ten < 2 tens. So 712 < 721. Order: 127, 271, 712, 721.
Marking note: Award 2 marks for the fully correct order. Award 1 mark if 2 out of 4 numbers are in the correct position.

8. Which is the smallest number?

405, 450, 504, 540

Answer: 405
Marks: 2
Working: Compare the hundreds digit: 405 and 450 have 4 hundreds; 504 and 540 have 5 hundreds. Between 405 and 450, compare the tens: 0 tens < 5 tens. So 405 is the smallest.
Marking note: Award 2 marks for "405". Award 0 marks for any other answer.

9. Arrange the following numbers in order from biggest to smallest.

890, 809, 980, 908

Answer: 980, 908, 890, 809
Marks: 2
Working: Compare the hundreds digit: 980 and 908 have 9 hundreds; 890 and 809 have 8 hundreds. Between 980 and 908, compare the tens: 8 tens > 0 tens. So 980 > 908. Between 890 and 809, compare the tens: 9 tens > 0 tens. So 890 > 809. Order: 980, 908, 890, 809.
Marking note: Award 2 marks for the fully correct order. Award 1 mark if 2 out of 4 numbers are in the correct position.

10. Compare the two numbers. Write >, <, or =.

600 + 30 + 8 __________ 638

Answer: =
Marks: 2
Working: 600 + 30 + 8 = 638. So 638 = 638.
Marking note: Award 2 marks for "=". Award 0 marks for ">" or "<".

Section C: Number Patterns (Questions 11–15)

11. Find the missing numbers.

100, 200, 300, ______, ______

Answer: 400, 500
Marks: 2
Working: The pattern increases by 100 each time. 300 + 100 = 400, 400 + 100 = 500.
Marking note: Award 2 marks for both correct answers. Award 1 mark if only one answer is correct.

12. Find the missing numbers.

950, 900, 850, ______, ______

Answer: 800, 750
Marks: 2
Working: The pattern decreases by 50 each time. 850 − 50 = 800, 800 − 50 = 750.
Marking note: Award 2 marks for both correct answers. Award 1 mark if only one answer is correct.

13. Find the missing numbers.

425, 450, 475, ______, ______

Answer: 500, 525
Marks: 2
Working: The pattern increases by 25 each time. 475 + 25 = 500, 500 + 25 = 525.
Marking note: Award 2 marks for both correct answers. Award 1 mark if only one answer is correct.

14. Find the missing numbers.

760, 770, 780, ______, ______

Answer: 790, 800
Marks: 2
Working: The pattern increases by 10 each time. 780 + 10 = 790, 790 + 10 = 800.
Marking note: Award 2 marks for both correct answers. Award 1 mark if only one answer is correct.

15. Find the missing numbers.

500, 550, 600, ______, ______

Answer: 650, 700
Marks: 2
Working: The pattern increases by 50 each time. 600 + 50 = 650, 650 + 50 = 700.
Marking note: Award 2 marks for both correct answers. Award 1 mark if only one answer is correct.

Section D: Odd and Even Numbers (Questions 16–18)

16. Is 348 an odd or even number?

Answer: Even
Marks: 2
Working: Look at the ones digit. The ones digit is 8, which is an even number. So 348 is even.
Marking note: Award 2 marks for "Even". Award 0 marks for "Odd".

17. Circle all the odd numbers in the list below.

235, 460, 517, 882, 693

Answer: 235, 517, 693
Marks: 2
Working: Check the ones digit of each number:

• 235 → ones digit is 5 (odd) ✓
• 460 → ones digit is 0 (even) ✗
• 517 → ones digit is 7 (odd) ✓
• 882 → ones digit is 2 (even) ✗
• 693 → ones digit is 3 (odd) ✓

The odd numbers are 235, 517, and 693.
Marking note: Award 2 marks for all three correct answers. Award 1 mark if 1 or 2 correct answers are given.

18. Write the next even number after 756.

Answer: 758
Marks: 2
Working: 756 is even (ones digit is 6). The next number is 757 (odd), and the one after that is 758 (even). So the next even number after 756 is 758.
Marking note: Award 2 marks for "758". Award 1 mark if the student writes "757" (showing they added 1 but did not check for evenness).

Section E: Reading, Writing, and Reasoning (Questions 19–20)

19. Write the following number in words.

824

Answer: Eight hundred and twenty-four
Marks: 4
Working: 824 has 8 hundreds, 2 tens, and 4 ones. In words: "Eight hundred and twenty-four".
Marking note: Award 4 marks for the fully correct answer. Award 3 marks for minor spelling errors (e.g., "eigth" instead of "eight"). Award 2 marks if the student writes "eight hundred twenty-four" (missing "and" — acceptable in some contexts but not standard Singapore format). Award 1 mark if only part of the number is correct in words. Award 0 marks for a completely incorrect answer.

20. A mystery number has:

• 5 in the hundreds place
• 3 in the tens place
• 9 in the ones place

(a) What is the mystery number? (2 marks)

Answer: 539
Working: Hundreds place = 5, tens place = 3, ones place = 9. So the number is 539.
Marking note: Award 2 marks for "539". Award 1 mark if the student shows correct understanding of place value but makes an error in writing the number.

(b) Is this number odd or even? Explain your answer. (2 marks)

Answer: Odd, because the ones digit is 9, which is an odd number.
Working: To decide if a number is odd or even, look at the ones digit. The ones digit of 539 is 9. Since 9 is an odd number, 539 is odd.
Marking note: Award 2 marks for correctly identifying the number as odd AND giving a valid explanation referencing the ones digit. Award 1 mark for correctly identifying the number as odd without an explanation, or for an incorrect answer with a valid explanation method. Award 0 marks for an incorrect answer with no explanation.

End of Answer Key