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Primary 6 PSLE Mathematics Whole Numbers Quiz
Free P6 PSLE Maths Whole Numbers quiz, Ox Exam version, with questions, answers, and PSLE-focused practice for Singapore students.
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Primary 6 PSLE Mathematics Quiz - Whole Numbers — Answer Key
Assessment: SA2 Practice — Version 1 of 5
Answer 1.
C) 700 000 — the digit 7 is in the hundred thousands place. (2 marks)
Answer 2.
C) 251 004 — it is more than 250 000, so it rounds up to 300 000. (2 marks)
Answer 3.
44 — follow order of operations: 36 ÷ 6 = 6; 6 × 5 = 30; 24 + 30 − 10 = 44. (2 marks)
Answer 4.
24 — multiples of 8: 8, 16, 24; multiples of 12: 12, 24; smallest common multiple is 24. (2 marks)
Answer 5.
43 — differences increase by 2 each time (+4, +6, +8, +10), so add 12: 31 + 12 = 43. (2 marks)
Answer 6.
10 620 — split 45 into 40 + 5: 236 × 40 = 9 440; 236 × 5 = 1 180; 9 440 + 1 180 = 10 620. (3 marks)
Answer 7.
Each pupil receives 34 beads; 6 beads left over — 584 ÷ 17 = 34 remainder 6; check: 17 × 34 = 578, and 584 − 578 = 6. (3 marks)
Answer 8.
12 — factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, 36; factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48; greatest common factor is 12. (3 marks)
Answer 9.
08:36 — list multiples of 12: 12, 24, 36; multiples of 18: 18, 36; LCM = 36, so they next ring together 36 minutes after 08:00, which is 08:36. (3 marks)
Answer 10.
195 000 — 3 892 ≈ 3 900 (nearest hundred); 47 ≈ 50 (nearest ten); 3 900 × 50 = 195 000. (3 marks)
Answer 11.
3 072 toys — 128 × 24 = 128 × 20 + 128 × 4 = 2 560 + 512 = 3 072. (3 marks)
Answer 12.
150 albums — stamps left: 5 000 − 1 250 = 3 750; albums needed: 3 750 ÷ 25 = 150. (3 marks)
Answer 13.
170 — draw a unit model: smaller number = 1 unit, larger number = 4 units; 5 units = 850; 850 ÷ 5 = 170. (3 marks)
Answer 14.
73 — the number = 1 095 ÷ 15 = 73; check: 73 × 15 = 1 095. (3 marks)
Answer 15.
619 chairs — chairs in full rows: 34 × 18 = 612; total: 612 + 7 = 619. (3 marks)
Answer 16.
$1 133 — cost of laptops: 3 × 1 289 = 3 867; change: 5 000 − 3 867 = 1 133. Remember to state the answer with units. (4 marks)
Answer 17.
1 340 pens — pens sold: 185 × 6 = 1 110; pens left: 2 450 − 1 110 = 1 340. (4 marks)
Answer 18.
544 — model with units: larger = 8 units, smaller = 1 unit; difference = 7 units = 476; 1 unit = 476 ÷ 7 = 68; larger number = 8 × 68 = 544. Check: 544 − 68 = 476. (4 marks)
Answer 19.
115 trays — total buns: 2 340 + 1 800 = 4 140; trays needed: 4 140 ÷ 36 = 115 exactly, so he needs 115 trays. (4 marks)
Answer 20.
4 children — assume all 12 were adults: 12 × 45 = 540; excess paid: 540 − 472 = 68; swapping an adult for a child saves 45 − 28 = 17; number of children: 68 ÷ 17 = 4 (and 12 − 4 = 8 adults). Check: 8 × 45 + 4 × 28 = 360 + 112 = 472. ✓ (4 marks)