O-Level Mathematics 3

Question 1

What is the interior angle of a regular hexagon?

Accepted Answer

120°

Answer

Sum of interior angles = (6-2)×180° = 720°. Each angle = 720°÷6 = 120°.

Question 2

Expand and simplify: (x+3)(x-2)

Accepted Answer

x²+x-6

Answer

(x+3)(x-2) = x²-2x+3x-6 = x²+x-6.

Question 3

A bag contains 3 red and 5 blue balls. What is the probability of picking a red ball?

Accepted Answer

3/8

Answer

P(red) = 3/(3+5) = 3/8.

Question 4

What is the HCF of 36 and 48?

Accepted Answer

12

Answer

Factors of 36: 1,2,3,4,6,9,12,18,36. Factors of 48: 1,2,3,4,6,8,12,16,24,48. HCF = 12.

Question 5

Simplify: √75

Accepted Answer

5√3

Answer

√75 = √(25×3) = 5√3.

GCE O-Level Practice Test