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JAMB Mathematics 2000 Question 5

Question 5

Fractions, Decimals and Approximation

Evaluate (2.813 × 10−3 × 1.063)/(5.637 × 10−2) reducing each number to two sig. fig. and leaving your answer in two significant figures.

  1. A.0.056
  2. B.0.055
  3. C.0.054
  4. D.0.54
Show the answer and explanation

Answer: B (0.055)

Explanation

To 2 s.f. the numbers are 2.8 × 10−3, 1.1 and 5.6 × 10−2. (0.0028 × 1.1)/0.056 = 0.00308/0.056 = 0.055.