N-Level Mathematics 4

Question 1

What is the volume of a cube with side length 3 cm?

Accepted Answer

27 cm³

Answer

Volume = side³ = 3³ = 3 × 3 × 3 = 27 cm³.

Question 2

An item costs $120 after a 20% discount. What was the original price?

Accepted Answer

$150

Answer

If 80% of original = $120, then original = 120 ÷ 0.8 = $150.

Question 3

Plot the point (3, -2) on a Cartesian plane. Which quadrant is it in?

Accepted Answer

Fourth quadrant

Answer

(3, -2): x is positive and y is negative. This is the fourth quadrant (bottom right).

Question 4

Solve: x/3 = 5

Accepted Answer

x = 15

Answer

Multiply both sides by 3: x = 5 × 3 = 15.

Question 5

What is 2.45 rounded to 1 decimal place?

Accepted Answer

2.5

Answer

Look at the second decimal place: 5. Since it is 5 or more, round up the first decimal place: 2.5.

GCE N-Level Practice Test