O-Level Mathematics 1

Question 1

Solve for x: 3x + 7 = 22

Accepted Answer

5

Answer

3x = 22 - 7 = 15, so x = 15 ÷ 3 = 5.

Question 2

What is the value of 2³ × 4?

Accepted Answer

32

Answer

2³ = 8, and 8 × 4 = 32.

Question 3

Factorise: x² - 9

Accepted Answer

(x+3)(x-3)

Answer

x² - 9 is a difference of two squares: (x+3)(x-3).

Question 4

A rectangle has length 12 cm and width 5 cm. What is its area?

Accepted Answer

60 cm²

Answer

Area = length × width = 12 × 5 = 60 cm².

Question 5

What is 15% of 200?

Accepted Answer

30

Answer

15% of 200 = (15/100) × 200 = 30.

GCE O-Level Practice Test