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WAEC Mathematics 2006 Question 1

Question 1

Fractions, Decimals and Approximation

Evaluate (0.13)3 correct to three significant figures.

  1. A.0.00219
  2. B.0.00220
  3. C.0.00300
  4. D.0.00390
Show the answer and explanation

Answer: B (0.00220)

Explanation

0.13 × 0.13 × 0.13 = 0.002197. The first three significant figures are 2, 1, 9 and the next digit 7 rounds the 9 up, giving 0.00220.