PSLE Mathematics Concepts 2 — Questions and Answers
Question 1: What is the highest common factor (HCF) of 24 and 36?
- 6
- 8
- 12 (Correct answer)
- 18
Correct answer: 12
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24. Factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, 36. HCF = 12.
Question 2: What type of angle measures exactly 90°?
- Acute angle
- Obtuse angle
- Right angle (Correct answer)
- Reflex angle
Correct answer: Right angle
A right angle measures exactly 90°. Acute is less than 90°, obtuse is between 90° and 180°.
Question 3: What is 2/3 + 1/4?
- 3/7
- 11/12 (Correct answer)
- 5/12
- 3/12
Correct answer: 11/12
LCD of 3 and 4 is 12. 2/3 = 8/12 and 1/4 = 3/12. 8/12 + 3/12 = 11/12.
Question 4: How many faces does a triangular prism have?
- 3
- 4
- 5 (Correct answer)
- 6
Correct answer: 5
A triangular prism has 5 faces: 2 triangular faces and 3 rectangular faces.
Question 5: Which number is a prime number?
- 15
- 21
- 23 (Correct answer)
- 27
Correct answer: 23
23 is prime because it has only two factors: 1 and 23. The others are divisible by 3.
Question 6: What is 3/5 of 450?
- 270 (Correct answer)
- 300
- 150
- 225
Correct answer: 270
3/5 × 450 = (3 × 450) ÷ 5 = 1,350 ÷ 5 = 270.
PSLE Mathematics Concepts 2
What is the highest common factor (HCF) of 24 and 36?