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JAMB Mathematics 2009 Question 4

Question 4

Fractions, Decimals and Approximation

Evaluate (81.81 + 99.44)/(20.09 + 36.16) correct to 3 significant figures.

  1. A.6.21
  2. B.3.22
  3. C.2.78
  4. D.2.13
Show the answer and explanation

Answer: B (3.22)

Explanation

The top is 181.25 and the bottom is 56.25, and 181.25 ÷ 56.25 = 3.222..., which is 3.22 to 3 s.f.