PSLE Mathematics Concepts 2

Question 1

What is the highest common factor (HCF) of 24 and 36?

Accepted Answer

12

Answer

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°?

Accepted Answer

Right angle

Answer

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?

Accepted Answer

11/12

Answer

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?

Accepted Answer

5

Answer

A triangular prism has 5 faces: 2 triangular faces and 3 rectangular faces.

Question 5

Which number is a prime number?

Accepted Answer

23

Answer

23 is prime because it has only two factors: 1 and 23. The others are divisible by 3.

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