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JAMB Mathematics 1987 Question 13

Question 13

Fractions, Decimals and Approximation

Instead of writing 35/6 as a decimal correct to 3 significant figures, a student wrote it correct to 3 places of decimals. Find his error in standard form.

  1. A.0.003
  2. B.3.0 × 10−3
  3. C.0.3 × 10−2
  4. D.0.3 × 10−3
Show the answer and explanation

Answer: B (3.0 × 10−3)

Explanation

35/6 = 5.8333…, which is 5.83 to 3 s.f. and 5.833 to 3 d.p. The error is 0.003, which in standard form is 3.0 × 10−3.