PSLE Mathematics Concepts 3 — Questions and Answers
Question 1: What is the order of rotational symmetry of a square?
- 1
- 2
- 4 (Correct answer)
- 8
Correct answer: 4
A square looks the same 4 times during a full 360° rotation (at 90°, 180°, 270°, and 360°), so it has order 4.
Question 2: Express 7/20 as a percentage.
- 35% (Correct answer)
- 70%
- 14%
- 3.5%
Correct answer: 35%
7/20 = 7 × 5 / (20 × 5) = 35/100 = 35%.
Question 3: What is the next number in the pattern: 2, 6, 18, 54, ___?
- 108
- 162 (Correct answer)
- 72
- 216
Correct answer: 162
Each number is multiplied by 3. 54 × 3 = 162.
Question 4: How many lines of symmetry does an equilateral triangle have?
- 1
- 2
- 3 (Correct answer)
- 6
Correct answer: 3
An equilateral triangle has 3 lines of symmetry, one from each vertex to the midpoint of the opposite side.
Question 5: What is the value of 4.5 × 10³?
- 45
- 450
- 4,500 (Correct answer)
- 45,000
Correct answer: 4,500
10³ = 1,000. So 4.5 × 1,000 = 4,500.
Question 6: If a = 5 and b = 3, what is the value of 2a + 3b?
- 19 (Correct answer)
- 21
- 16
- 25
Correct answer: 19
2a + 3b = 2(5) + 3(3) = 10 + 9 = 19.
PSLE Mathematics Concepts 3
What is the order of rotational symmetry of a square?