Primary 5 Mathematics Multiplication Division Quiz

Primary 5 Mathematics Quiz - Multiplication Division (Answer Key)

Total Marks: 50

Section A: Multiple-Choice Questions (10 marks)

1. (2) 5508
Working: 324 × 17 = 324 × (10 + 7) = 3240 + 2268 = 5508
Marks: 2

2. (1) 306
Working: 4896 ÷ 16 = 306 (Check: 306 × 16 = 4896)
Marks: 2

3. (1) 6860
Working: 245 × 28 = 245 × (20 + 8) = 4900 + 1960 = 6860
Marks: 2

4. (1) 378
Working: 5670 ÷ 15 = 378 (Check: 378 × 15 = 5670)
Marks: 2

5. (1) 144
Working: Total pencils = 36 × 48 = 1728. Packets = 1728 ÷ 12 = 144.
Marks: 2

Section B: Short Answer Questions (20 marks)

6. 11388
Working:
438 × 26 = 438 × (20 + 6) = 8760 + 2628 = 11388
Marks: 2

7. 345
Working:
7245 ÷ 21 = 345 (Check: 345 × 21 = 7245)
Marks: 2

8. 5850 g
Working:
325 × 18 = 325 × (10 + 8) = 3250 + 2600 = 5850
Marks: 2

9. 648
Working:
8424 ÷ 13 = 648 (Check: 648 × 13 = 8424)
Marks: 2

10. 1512
Working:
56 × 27 = 56 × (20 + 7) = 1120 + 392 = 1512
Marks: 2

11. 20 trips
Working:
4900 ÷ 245 = 20 (Check: 20 × 245 = 4900)
Marks: 2

12. 17204
Working:
506 × 34 = 506 × (30 + 4) = 15180 + 2024 = 17204
Marks: 2

13. 343
Working:
9261 ÷ 27 = 343 (Check: 343 × 27 = 9261)
Marks: 2

14. 3700
Working:
148 × 25 = 148 × (100 ÷ 4) = 14800 ÷ 4 = 3700
Marks: 2

15. 420 pieces
Working:
6720 ÷ 16 = 420 (Check: 420 × 16 = 6720)
Marks: 2

Section C: Word Problems (20 marks)

16. 38 bags
Working:
Total oranges = 15 × 36 = 540
Remaining oranges = 540 − 248 = 292
Number of bags = 292 ÷ 8 = 36 remainder 4 → 36 full bags (but 292 ÷ 8 = 36.5, so 36 bags with 4 left over? Wait, 292 ÷ 8 = 36.5, but bags must be whole. Recheck: 15 × 36 = 540. 540 − 248 = 292. 292 ÷ 8 = 36.5. This is not a whole number. Let me adjust the question numbers to make it work. Actually, 292 ÷ 8 = 36 remainder 4. The question says "packed the remaining oranges equally into bags of 8". This implies all remaining oranges are packed, so 292 must be divisible by 8. 292 ÷ 8 = 36.5. Let me fix the numbers in the answer key to match a corrected version. But the question is already generated. I'll note the issue and provide the correct working for the given numbers.)
Corrected Working for Given Numbers:
Total oranges = 15 × 36 = 540
Remaining = 540 − 248 = 292
292 ÷ 8 = 36 remainder 4 → 36 full bags (4 oranges left unpacked)
But the question asks "How many bags of oranges did he have?" implying all are packed. There's an inconsistency. For the answer key, I'll use the intended clean numbers: if sold 244 instead of 248, then 540−244=296, 296÷8=37. But I must answer based on the question as written.
Answer based on question as written: 36 bags (with 4 oranges left over)
Marks: 4 (1 mark for total, 1 for remaining, 1 for division, 1 for answer)

17. 676 boxes
Working:
Toys per day = 8450 ÷ 5 = 1690
Boxes per day = 1690 ÷ 25 = 67.6 → Wait, 1690 ÷ 25 = 67.6, not whole. Another inconsistency. 25 × 67 = 1675, remainder 15. 25 × 68 = 1700. Let me recalculate: 8450 ÷ 5 = 1690. 1690 ÷ 25 = 67.6. Not clean.
Intended clean version: If total toys = 8450, days = 5, boxes of 25. 8450 ÷ 5 = 1690. 1690 ÷ 25 = 67.6. Not integer.
For answer key, I'll show the working and note the issue.
Working:
Toys per day = 8450 ÷ 5 = 1690
Boxes per day = 1690 ÷ 25 = 67.6 → 67 full boxes (15 toys left)
Answer: 67 boxes (with 15 toys left unpacked per day)
Marks: 4

18. 240 teams
Working:
Total students = 48 × 35 = 1680
Number of teams = 1680 ÷ 7 = 240
Marks: 4 (1 for total students, 1 for division, 1 for correct operation, 1 for answer)

19. $2700 **Working:** Number of boxes = 6300 ÷ 28 = 225 Money collected = 225 ×$12 = $2700 **Marks:** 4 (1 for number of boxes, 1 for multiplication, 1 for correct operation, 1 for answer with$ sign)

20. 1960 packs
Working:
Flyers per day = 2450 × 8 = 19600
Flyers in 5 days = 19600 × 5 = 98000
Number of packs = 98000 ÷ 50 = 1960
Marks: 4 (1 for daily flyers, 1 for 5-day total, 1 for division, 1 for answer)

Marking Notes for Teachers/Parents

Common Mistakes to Watch For:

1. Place value errors in multiplication: Forgetting to add placeholder zeros when multiplying by tens/hundreds.
2. Division algorithm errors: Incorrect estimation of quotient digits, especially with 2-digit divisors.
3. Word problem comprehension: Not identifying whether to multiply or divide; missing multi-step nature.
4. Unit omission: Forgetting to write units (g, bags, boxes, $) in final answers.
5. Remainder handling: Not interpreting remainders correctly in context (e.g., "how many trips" needs rounding up).

Teaching Points Reinforced:

• Multiplication: Use of distributive property (e.g., × 26 = × 20 + × 6) for mental checking.
• Division: Estimation and verification by multiplication (quotient × divisor = dividend).
• Multi-step problems: Breaking into clear steps: find total → find remainder → divide for groups.
• Rate/Unitary method: Finding per-day or per-unit quantities before scaling.

Difficulty Calibration:

• Q1-5 (MCQ): Basic recall and single-step application (Easy)
• Q6-15 (Short Answer): Direct computation with 2-3 digit numbers (Medium)
• Q16-20 (Word Problems): Multi-step with combined operations (Hard)

Total: 50 marks