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WAEC Mathematics 2013 Question 1

Question 1

Fractions, Decimals and Approximation

Multiply 2.7 × 10−4 by 6.3 × 106 and leave your answer in standard form.

  1. A.1.7 × 103
  2. B.1.70 × 103
  3. C.1.701 × 103
  4. D.17.01 × 103
Show the answer and explanation

Answer: C (1.701 × 103)

Explanation

2.7 × 6.3 = 17.01 and 10−4 × 106 = 102, so the product is 17.01 × 102 = 1.701 × 103.