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WAEC Mathematics 2007 Question 3

Question 3

Fractions, Decimals and Approximation

Simplify (0.3 × 105) ÷ (0.4 × 107), leaving your answer in the standard form.

  1. A.7.5 × 10−4
  2. B.7.5 × 10−3
  3. C.7.5 × 10−2
  4. D.7.5 × 10−1
Show the answer and explanation

Answer: B (7.5 × 10−3)

Explanation

0.3/0.4 = 0.75 and 105/107 = 10−2, so the result is 0.75 × 10−2 = 7.5 × 10−3.