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JAMB Mathematics 2017 Question 22

Question 22

Fractions, Decimals and Approximation

Evaluate (0.21 × 0.072 × 0.00054)/(0.006 × 1.68 × 0.063) correct to 4 s.f.

  1. A.0.01286
  2. B.0.01285
  3. C.0.1286
  4. D.0.1285
Show the answer and explanation

Answer: A (0.01286)

Explanation

Top = 8.1648 × 10−6 and bottom = 6.3504 × 10−4. The quotient is 0.012857…, which is 0.01286 to 4 significant figures.