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Primary 2 Mathematics Practice Paper 3
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TuitionGoWhere Practice Paper – Answer Key
Primary 2 Mathematics: Numbers (Version 3 of 5)
Total Marks: 50
Section A: Multiple Choice (10 marks)
| Question | Answer | Working / Explanation |
|---|---|---|
| 1 | (B) 80 | The digit 8 is in the tens place. In 482: 4 is hundreds (400), 8 is tens (80), 2 is ones (2). Value of 8 = 8 × 10 = 80. |
| 2 | (A) 309 | Compare hundreds digits first: 309 and 390 have 3 hundreds; 903 and 930 have 9 hundreds. Between 309 and 390: tens digits are 0 and 9, so 309 < 390. 309 is smallest. |
| 3 | (C) 390 | 350 + 40: 350 + 40 = 300 + 50 + 40 = 300 + 90 = 390. Or: 35 tens + 4 tens = 39 tens = 390. |
| 4 | (B) 613 | 648 − 35: Subtract ones: 8 − 5 = 3; subtract tens: 4 − 3 = 1; hundreds stay 6. Answer: 613. |
| 5 | (B) 350 | Even numbers end in 0, 2, 4, 6, or 8. 247 ends in 7 (odd), 350 ends in 0 (even), 555 ends in 5 (odd), 721 ends in 1 (odd). |
| 6 | (B) 700 | Pattern increases by 25 each time: 625 + 25 = 650; 650 + 25 = 675; 675 + 25 = 700; 700 + 25 = 725 ✓ |
| 7 | (B) 537 | 5 hundreds = 500; 3 tens = 30; 7 ones = 7. Total: 500 + 30 + 7 = 537. |
| 8 | (A) 298 | 200 + 90 + 8 = 200 + 90 = 290; 290 + 8 = 298. |
| 9 | (B) 799 | "Just before 800" means one less than 800. 800 − 1 = 799. |
| 10 | (A) 479 | For smallest 3-digit number, put smallest digit in hundreds place. But 4 is even, so check: 4 in hundreds, then 7 in tens, 9 in ones → 479 (odd ✓). Alternative 497 is larger. |
Section A Total: 10 marks
Section B: Short Answer (18 marks) + Question 20 (4 marks) = Extended section total as per mark allocation
Note: Questions 11–19 carry 18 marks; Question 20 carries 4 marks. Section B + C combined working below.
11. Write 567 in words. (1 mark)
Answer: Five hundred and sixty-seven
Teaching note: 5 in hundreds place → "five hundred", 6 in tens place → "sixty", 7 in ones place → "seven". We use "and" after "hundred" in Singapore convention.
12. Write six hundred and forty-three in numerals. (1 mark)
Answer: 643
Teaching note: "Six hundred" = 600, "forty" = 40, "three" = 3. Add: 600 + 40 + 3 = 643.
13. What is the greatest 3-digit number that can be formed using the digits 2, 6, and 9? (2 marks)
Answer: 962
Method (1 mark): To make the greatest number, put the largest digit in the hundreds place, the next largest in the tens place, and the smallest in the ones place.
Digits in order: 9 > 6 > 2
So: 9 in hundreds, 6 in tens, 2 in ones → 962 (1 mark)
Common mistake: Putting 269 (smallest number) or not using all digits.
14. Arrange 408, 384, 480, 438 from smallest to biggest. (2 marks)
Answer: 384, 408, 438, 480
Method: Compare hundreds digits first:
- 384 has 3 hundreds (smallest group)
- 408, 438, 480 have 4 hundreds
Among 408, 438, 480: compare tens digits: 0 < 3 < 8
Order: 384 → 408 → 438 → 480
Marking: All in correct order (2 marks). Three in correct position (1 mark).
15. Find the missing numbers: 195, 210, 225, ______, ______, 270 (2 marks)
Answer: 240, 255
Method (1 mark each): Find the pattern rule: 210 − 195 = 15; 225 − 210 = 15. Pattern adds 15 each time.
225 + 15 = 240
240 + 15 = 255
Check: 255 + 15 = 270 ✓
16. 245 boys + 318 girls = ? children (3 marks)
Answer: 563 children
Working:
245
+ 318
-----
Step 1: Ones: 5 + 8 = 13, write 3, carry 1 to tens (1 mark) Step 2: Tens: 4 + 1 + 1 = 6, write 6 (1 mark) Step 3: Hundreds: 2 + 3 = 5, write 5 → 563 (1 mark)
17. 500 − 175 = ? stickers (3 marks)
Answer: 325 stickers
Working:
500
- 175
-----
Step 1: Ones: 0 − 5, need to regroup. 500 becomes 490 + 10. 10 − 5 = 5 (1 mark) Step 2: Tens: 9 − 7 = 2 (after regrouping) (1 mark) Step 3: Hundreds: 4 − 1 = 3 → 325 (1 mark)
Common mistake: Writing 425 (forgetting to regroup hundreds to tens).
18. Peter has 56 more than John's 128 marbles. (3 marks)
Answer: 184 marbles
Working: "More than" means addition.
128 + 56:
Step 1: Ones: 8 + 6 = 14, write 4, carry 1 (1 mark) Step 2: Tens: 2 + 5 + 1 = 8, write 8 (1 mark) Step 3: Hundreds: 1 + 0 = 1 → 184 (1 mark)
19. 463 − 148 − 95 = ? chickens (4 marks)
Answer: 220 chickens
Working:
Method 1: Step by step Step 1: 463 − 148
463
- 148
-----
Ones: 3 − 8, regroup: 13 − 8 = 5 Tens: 5 − 4 = 1 (after regrouping) Hundreds: 3 − 1 = 2 → 315 (2 marks for correct first subtraction)
Step 2: 315 − 95
315
- 95
-----
Ones: 5 − 5 = 0 Tens: 1 − 9, regroup: 11 − 9 = 2 Hundreds: 2 − 0 = 2 → 220 (2 marks for correct second subtraction)
Marking alternative: 2 marks for complete correct method with one calculation error; 1 mark for correct operation choice only.
20. Place value chart showing 527 with base-10 blocks (4 marks total)
Expected visual from placeholder (Q20-fig1):
- Hundreds column: 5 flat squares (each = 100)
- Tens column: 2 long rods (each = 10)
- Ones column: 7 small cubes (each = 1)
- Total: 500 + 20 + 7 = 527
(a) What number is shown? (1 mark)
Answer: 527
(b) Value of digit in tens place? (1 mark)
Answer: 20 (or 2 tens)
Teaching note: The digit is 2, but its value is 2 × 10 = 20. Common error: answering "2" (confusing digit with value).
(c) Take away 3 tens, what is the new number? (2 marks)
Working: Original number: 527 3 tens = 30
527 − 30 = 497 (2 marks)
Or using place value: 5 hundreds, 2 tens, 7 ones → take 3 tens → need to regroup: 4 hundreds, 12 tens, 7 ones → 4 hundreds, 9 tens, 7 ones = 497
Marking: Correct method shown (1 mark), correct answer 497 (1 mark).
END OF ANSWER KEY
Total marks verification: 10 + 1 + 1 + 2 + 2 + 2 + 3 + 3 + 3 + 4 + 4 = 50 marks ✓