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Primary 4 Mathematics Decimals Quiz
Free P4 Maths Decimals quiz, Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.
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P4 Maths Quiz: Decimals - Answer Key
Questions: 20
Time: 30 minutes
Total Marks: 40
Section A: Multiple Choice Questions (10 marks)
1. Which decimal is the greatest? (2 marks) Answer: (3) 0.138 Explanation: Compare tenths place: 0.1 > 0.0; then hundredths: 0.138 > 0.129 > 0.103
2. Arrange these decimals from smallest to largest: 0.47, 0.407, 0.74 (2 marks) Answer: (2) 0.407, 0.47, 0.74 Explanation: Compare tenths: 0.407 < 0.47 < 0.74
3. Which decimal is equivalent to 3/10? (2 marks) Answer: (2) 0.3 Explanation: 3/10 = 3 ÷ 10 = 0.3
4. Round 19.199 to 1 decimal place. (2 marks) Answer: (2) 19.2 Explanation: Look at hundredths place: 9 ≥ 5, so round up to 19.2
5. Express 0.05 as a fraction in simplest form. (2 marks) Answer: (3) 1/20 Explanation: 0.05 = 5/100 = 1/20 (simplified by dividing by 5)
Section B: Short Answer Questions (15 marks)
6. Write these decimals in order from smallest to greatest: (3 marks) 2.38, 2.083, 2.8, 2.308
Working: Compare tenths place: 2.083 < 2.308 < 2.38 < 2.8
Answer: 2.083, 2.308, 2.38, 2.8
7. Calculate: (3 marks) 6.75 + 3.48 = ?
Working:
6.75
+ 3.48
------
10.23
Answer: 10.23
8. Calculate: (3 marks) 8.2 - 5.67 = ?
Working:
8.20
- 5.67
------
2.53
Answer: 2.53
9. Convert these fractions to decimals: (3 marks)
(a) 1/4 = 0.25 (1 ÷ 4 = 0.25)
(b) 3/5 = 0.6 (3 ÷ 5 = 0.6)
(c) 7/10 = 0.7 (7 ÷ 10 = 0.7)
10. Round these decimals to the nearest whole number: (3 marks)
**(a) 12.7 = 13** (7 ≥ 5, round up)
**(b) 8.49 = 8** (4 < 5, round down)
**(c) 15.5 = 16** (5 ≥ 5, round up)
Section C: Word Problems (15 marks)
11. Mrs Lim bought 2.5 kg of apples and 1.8 kg of oranges. What was the total mass of fruits she bought? (4 marks)
Working:
2.5 + 1.8 = 4.3
Answer: 4.3 kg
12. John ran 3.75 km on Monday and 2.9 km on Tuesday. How much further did he run on Monday than on Tuesday? (4 marks)
Working:
3.75 - 2.9 = 3.75 - 2.90 = 0.85
Answer: 0.85 km
13. A bottle contains 1.25 litres of water. If Sarah drinks 0.4 litres, how much water is left in the bottle? (4 marks)
Working:
1.25 - 0.4 = 1.25 - 0.40 = 0.85
Answer: 0.85 litres
14. Tom bought 4 notebooks at $2.35 each. How much did he pay altogether? (3 marks)
Working:
4 × $2.35 = $9.40
Answer: $9.40
Marking Scheme Summary
| Section | Total Marks | Question Breakdown |
|---|---|---|
| A (MCQ) | 10 marks | 5 questions × 2 marks each |
| B (Short Answer) | 15 marks | 5 questions (3+3+3+3+3 marks) |
| C (Word Problems) | 15 marks | 4 questions (4+4+4+3 marks) |
| Total | 40 marks | 14 questions |
Topics Tested:
- Decimal comparison and ordering
- Decimal place value understanding
- Decimal-fraction conversions
- Decimal rounding
- Decimal addition and subtraction
- Real-world decimal applications
Key Learning Objectives:
- Compare and order decimals correctly
- Convert between fractions and decimals
- Perform decimal operations accurately
- Round decimals to specified places
- Apply decimal skills to word problems
- Understand decimal place value system