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WAEC Mathematics 2001 Question 1

Question 1

Fractions, Decimals and Approximation

Which of the following correctly expresses 48 as a product of prime factors?

  1. A.3 × 4 × 4
  2. B.2 × 3 × 8
  3. C.2 × 2 × 3 × 4
  4. D.2 × 2 × 2 × 2 × 3.
Show the answer and explanation

Answer: D (2 × 2 × 2 × 2 × 3.)

Explanation

Only D uses prime numbers alone: 2 × 2 × 2 × 2 × 3 = 48. 4 and 8 are not prime.