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Primary 4 Mathematics Whole Numbers Quiz
Free P4 Maths Whole Numbers quiz, Ox AI version, with questions, answers, and syllabus-aligned practice for Singapore students.
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Answers
Primary 4 Mathematics Quiz - Whole Numbers: Answer Key
Total Marks: 60
Section A
Answer 1.
(a) 43,609 (b) 70,020 Marking note: 1 mark for each correct numeral. Check placement of zeros carefully — "seventy thousand and twenty" needs a zero in the hundreds place.
Answer 2.
(a) 8 (b) 6,000 (six thousands) Explanation: In 86,351, the digit 8 is in the ten thousands place. The digit 6 is in the thousands place, so it stands for 6 × 1,000 = 6,000.
Answer 3.
51,909 < 51,990 < 52,009 < 52,090 Reasoning: Compare the ten thousands digit first (all are 5), then the thousands digit (51,... comes before 52,...), then compare within each group.
Answer 4.
(a) 48,600 (b) 49,000 Explanation: The tens digit is 6, so round up to 48,600. The hundreds digit is 5, so round up to 49,000.
Answer 5.
(a) < (b) > Explanation: 27,450 is smaller than 27,540 because 4 hundreds < 5 hundreds. 61,009 is greater than 60,999 because 61 thousand > 60 thousand.
Answer 6.
29,500; 31,000 Explanation: The pattern adds 1,500 each time: 28,000 + 1,500 = 29,500; 29,500 + 1,500 = 31,000.
Section B
Answer 7.
(a) 87,530 (b) 30,578 Working: For the greatest number, place the largest digits first: 8, 7, 5, 3, 0 → 87,530. For the smallest number, place the smallest non-zero digit first (0 cannot lead): 3, then 0, 5, 7, 8 → 30,578.
Answer 8.
36,750 + 4,000 = 40,750 Working: Adding 4,000 increases only the thousands digit: 36 + 4 = 40 thousand.
Answer 9.
72,300 − 58,650 = 13,650 Working: Set out vertically and regroup across the hundreds and tens columns.
Answer 10.
24,875 + 17,396 = 42,271 Working: Add ones, tens, hundreds, thousands and ten thousands in turn, carrying where needed.
Answer 11.
245 × 30 = 7,350 Working: 245 × 3 = 735, then multiply by 10: 735 × 10 = 7,350.
Answer 12.
960 ÷ 6 = 160 Working: 96 ÷ 6 = 16, so 960 ÷ 6 = 160. Check: 160 × 6 = 960. ✓
Answer 13.
46,520 − 38,975 = 7,545 Final answer: 7,545 more bottles Marking note: 1 mark for method, 1 mark for accurate subtraction, 1 mark for correct final statement.
Answer 14.
47,658 rounds to 48,000; 32,275 rounds to 32,000. 48,000 + 32,000 = 80,000 Estimated answer: 80,000 Note: Round before adding — this is estimation practice, not exact addition.
Section C
Answer 15.
24,356 + 18,795 = 43,151 Final answer: 43,151 books Working: Add the two quantities; carry from ones through ten thousands as needed.
Answer 16.
8,900 = 50,000 − 17,450 Final answer: 50,000 − 26,350; 8,900 = $17,450.
Answer 17.
8 × 125 = 1,000 1,000 − 96 = 904 Final answer: 904 chairs Explanation: First find the total number of chairs, then subtract those removed.
Answer 18.
45 × 200 = 9,000 9,000 − 3,500 = 5,500 Final answer: 5,500 seats Explanation: Total seats minus sold tickets gives the empty seats.
Answer 19.
4,800 ÷ 60 = 80 Final answer: 80 Reasoning: Since 60 × ? = 4,800, divide the product by the known factor. Check: 60 × 80 = 4,800. ✓
Answer 20.
Any two numbers from 49,500 to 50,499 (for example, 49,600 and 50,300) Explanation: Numbers from 49,500 up to 50,499 round to 50,000 when rounded to the nearest thousand. Accept any two different values in this range.