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Primary 3 Mathematics Whole Numbers Quiz
Free P3 Maths Whole Numbers quiz, Ox AI version, with questions, answers, and syllabus-aligned practice for Singapore students.
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Answers
Primary 3 Mathematics Quiz - Whole Numbers: Answer Key
Answer 1.
The digit 8 is in the hundreds place.
Marking note: Award 2 marks for the correct digit. A common error is choosing 2 (tens) or 5 (thousands).
Answer 2.
The digit 7 is in the hundreds place, so its value is 700.
New-student tip: The value of a digit means what it is worth in the whole number, not just the digit itself.
Answer 3.
Six thousand and thirty-five
Marking note: Accept with or without "and" after "thousand", but spelling must be correct.
Answer 4.
9,208
New-student tip: Nine thousands → 9,000; two hundreds → 200; no tens; eight ones → 8. Combine: 9,208.
Answer 5.
3,907 is greater.
Reasoning: Compare thousands first (both 3), then hundreds: 9 > 7, so 3,907 > 3,799.
Answer 6.
4,050, 4,150
Reasoning: Counting on in hundreds means adding 100 each time: 3,950 + 100 = 4,050; 4,050 + 100 = 4,150.
Answer 7.
Pattern increases by 25: 1,275, 1,300
Reasoning: 1,225 − 1,200 = 25, so keep adding 25: 1,250 + 25 = 1,275; 1,275 + 25 = 1,300.
Answer 8.
(a) Greatest: 9,831 (b) Smallest: 1,389
Reasoning: For the greatest number, place the largest digit (9) in the thousands place, then 8, 3, 1. For the smallest, place the smallest non-zero digit (1) first, then arrange 3, 8, 9 in increasing order.
Answer 9.
2,456 + 3,187 = 5,643
Working:
- Ones: 6 + 7 = 13 → write 3, carry 1
- Tens: 5 + 8 + 1 = 14 → write 4, carry 1
- Hundreds: 4 + 1 + 1 = 6
- Thousands: 2 + 3 = 5
Answer 10.
5,004 − 2,376 = 2,628
Working:
- Rename 5,004 as 4 thousands, 9 hundreds, 9 tens, 14 ones.
- Ones: 14 − 6 = 8
- Tens: 9 − 7 = 2
- Hundreds: 9 − 3 = 6
- Thousands: 4 − 2 = 2
Answer 11.
245 + 178 = 423 balloons
Reasoning: "Altogether" tells us to add the two amounts.
Answer 12.
900 − 465 = 435 children
Reasoning: Total people minus adults gives the number of children.
Answer 13.
Pattern increases by 45: 180, 225
Reasoning: 90 − 45 = 45, so keep adding 45: 135 + 45 = 180; 180 + 45 = 225.
Answer 14.
Rounded to the nearest hundred: 3,500
Reasoning: Look at the tens digit (8). Since 8 ≥ 5, round up: 3,400 → 3,500.
Answer 15.
Smallest to greatest: 6,052, 6,205, 6,250, 6,502
Reasoning: All numbers have 6 thousands. Compare the hundreds digit: 0 < 2 < 2 < 5. For the two numbers with 2 hundreds, compare tens: 0 < 5, so 6,205 < 6,250.
Answer 16.
(a) 7 × 300 = 2,100 (b) 480 ÷ 8 = 60
New-student tip: For (a), multiply 7 × 3 = 21, then attach two zeros. For (b), think 48 ÷ 8 = 6, then attach one zero.
Answer 17.
- Books received: 1,250 + 380 = 1,630
- Books given away: 1,630 − 275 = 1,355 books
Marking note: Award method marks for both steps even if the final answer is wrong. The answer must include the unit "books".
Answer 18.
- Apples packed: 6 × 125 = 750
- Apples left: 750 − 340 = 410 apples
Marking note: Two operations are needed: multiplication first, then subtraction. Units required.
Answer 19.
- Ben's money: 485 + 120 = $605
- Altogether: 485 + 605 = $1,090
New-student explanation: Ben has sign in the final answer.
Answer 20.
(a) Toys made: 250 × 5 = 1,250 toys (b) Good toys: 1,250 − 95 = 1,155 good toys
Marking note: Monday to Friday is 5 days. Award 2–3 marks for part (a) and 2–3 marks for part (b) depending on method shown. Both parts need units.