PSLE Mathematics Concepts 3

Question 1

What is the order of rotational symmetry of a square?

Accepted Answer

4

Answer

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.

Accepted Answer

35%

Answer

7/20 = 7 × 5 / (20 × 5) = 35/100 = 35%.

Question 3

What is the next number in the pattern: 2, 6, 18, 54, ___?

Accepted Answer

162

Answer

Each number is multiplied by 3. 54 × 3 = 162.

Question 4

How many lines of symmetry does an equilateral triangle have?

Accepted Answer

3

Answer

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?

Accepted Answer

4,500

Answer

10³ = 1,000. So 4.5 × 1,000 = 4,500.

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