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Primary 5 Mathematics Practice Paper 1
Free P5 Maths Practice Paper 1, LongCat AI version, with questions, answers, and syllabus-aligned practice for Singapore students.
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TuitionGoWhere Practice Paper — Answer Key
Subject: Mathematics | Level: Primary 5 | Paper: Practice Paper 1 of 5 | Total Marks: 50
Section A: Multiple Choice (10 marks)
1. D [2]
Working: In 3 725 406, the digit 7 is in the hundred thousands place. 7 × 100 000 = 700 000.
Common mistake: Students may confuse the place value and choose B (700) or C (70 000).
2. B [2]
Working: 4 567 891 — the ten thousands digit is 6, and the thousands digit is 7. Since 7 ≥ 5, round up: 4 570 000.
Common mistake: Students may look at the wrong digit and choose A or C.
3. A [2]
Working: Compare digit by digit from the left. All numbers start with 2 0. The third digit: A and C have 3, B has 4, so B is larger. Between A and C: A = 2 034 567, C = 2 034 657. The hundreds digit: A has 5, C has 6. So A < C. Between A and D: A = 2 034 567, D = 2 034 576. The tens digit: A has 6, D has 7. So A < D. A is the smallest.
Common mistake: Students may stop comparing too early.
4. C [2]
Working: 3 600 000 ÷ 1 000 = 3 600. Dividing by 1 000 removes three zeros.
Common mistake: Students may remove only two zeros (answer B) or add zeros (answer D).
5. A [2]
Working: 2 450 000 + 3 125 000 = 5 575 000. In words: five million five hundred and seventy-five thousand.
Common mistake: Students may forget "thousand" at the end (answer B) or miscalculate the sum.
Section B: Short Answer (20 marks)
6. 6 312 405 [2]
Working: Six million = 6 000 000; three hundred and twelve thousand = 312 000; four hundred and five = 405. Combined: 6 312 405.
Marking: Award 2 marks for the correct figure. Award 1 mark if the student shows correct place value understanding but makes a minor error.
7. 5 023 010 < 5 032 100 < 5 203 010 < 5 230 100 [2]
Working: Compare digit by digit. All start with 5. Third digit: the first two have 0, the last two have 2. Among those with 0: 5 023 010 vs 5 032 100 — fourth digit 2 < 3, so 5 023 010 is smaller. Among those with 2: 5 203 010 vs 5 230 100 — fourth digit 0 < 3, so 5 203 010 is smaller.
Marking: Award 2 marks for the correct order. Award 1 mark if 2 out of 4 positions are correct.
8. 4 667 890 [2]
Working: 4 567 890 + 100 000 = 4 667 890.
Common mistake: Students may add 10 000 instead of 100 000.
9. 2 640 000 ; 2 740 000 [2]
Working: The pattern increases by 100 000 each time. 2 540 000 + 100 000 = 2 640 000. 2 640 000 + 100 000 = 2 740 000.
Marking: Award 2 marks for both correct. Award 1 mark for one correct.
10. 265 000 [2]
Working: 1 250 000 − 985 000 = 265 000.
Common mistake: Students may misalign digits when subtracting.
11. 2 700 000 [2]
Working: 45 000 × 60 = 45 000 × 6 × 10 = 270 000 × 10 = 2 700 000.
Alternative: 45 × 6 = 270, then add the appropriate zeros (4 zeros total from 45 000 and 1 zero from 60 = 5 zeros): 2 700 000.
Marking: Award 2 marks for the correct answer with working. Award 1 mark for the correct answer without working.
12. 900 [2]
Working: 7 200 000 ÷ 8 000 = 7 200 000 ÷ 8 ÷ 1 000 = 900 000 ÷ 1 000 = 900.
Alternative: Cancel three zeros from both: 7 200 ÷ 8 = 900.
Common mistake: Students may cancel the wrong number of zeros.
13. 6 400 000 [2]
Working: 3 456 789 + 2 987 654 = 6 444 443. Rounding to the nearest hundred thousand: the ten thousands digit is 4, which is less than 5, so round down to 6 400 000.
Marking: Award 2 marks for the correct rounded answer. Award 1 mark if the student finds the correct sum but rounds incorrectly.
14. 4 608 025 [2]
Working: 4 millions = 4 000 000; 6 hundred thousands = 600 000; 8 thousands = 8 000; 2 tens = 20; 5 ones = 5. Combined: 4 608 025.
Common mistake: Students may omit a place value (e.g., forget the hundreds place is 0).
15. 540 000 [2]
Working: 5 600 000 − 5 000 000 − 60 000 = 540 000.
Alternative: The missing part is 500 000 + 40 000 = 540 000.
Marking: Award 2 marks for the correct answer.
Section C: Structured / Problem Solving (20 marks)
16.
(a) 3 750 000 + 8 000 000.
(b) 4 250 000 − 500 000.
Marking: Award 2 marks each for correct answer with working. Award 1 mark for correct answer without working or with a minor arithmetic error.
17.
(a) Science Museum [1]
Working: 2 345 678 is the largest number in the table.
(b) Art Museum [1]
Working: 1 234 567 is the smallest number in the table.
(c) 7 555 553 [2]
Working: 1 234 567 + 2 345 678 + 1 876 543 + 2 098 765 = 7 555 553.
Step-by-step:
1 234 567 + 2 345 678 = 3 580 245
3 580 245 + 1 876 543 = 5 456 788
5 456 788 + 2 098 765 = 7 555 553
Marking: Award 2 marks for the correct total with working. Award 1 mark for the correct total without working.
18.
(a) 2 400 boxes [2]
Working: 2 400 000 ÷ 1 000 = 2 400.
(b) 15 = $36 000.
Step-by-step: 2 400 × 15 = 2 400 × 10 + 2 400 × 5 = 24 000 + 12 000 = 36 000.
Marking: Award 2 marks each for correct answer with working. Award 1 mark for correct answer without working.
19.
(a) 3 456 789 < 3 456 879 < 3 546 798 [2]
Working: Compare digit by digit. All start with 3. The hundred thousands digit: the first two have 4, the third has 5, so 3 546 798 is the largest. Between 3 456 789 and 3 456 879: the hundreds digit is 7 vs 8, so 3 456 789 < 3 456 879.
(b) 10 460 466 [2]
Working: 3 456 789 + 3 546 798 + 3 456 879 = 10 460 466.
Step-by-step:
3 456 789 + 3 546 798 = 7 003 587
7 003 587 + 3 456 879 = 10 460 466
Marking: Award 2 marks each for correct answer with working.
20.
(a) 1 400 000 > 1 120 000 > 1 750 000) is the greatest, followed by Town V (1 250 000), Town Z (980 000) is the smallest.
(b) 1 250 000 + 1 750 000 + 1 400 000 = 1 250 000 + 2 230 000
1 750 000 = 3 980 000 + 5 100 000
1 400 000 = $6 500 000
(c) 7 000 000 − 500 000.
Marking: Award marks as indicated for each part. Award partial credit for correct method with minor arithmetic errors.