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UI Post-UTME Mathematics 2014 Question 35

Question 35

Fractions, Decimals and Approximation

Simplify ((1.25 × 104) × (2.0 × 10−1))/(6.25 × 105)

  1. A.4.0 × 10−3
  2. B.5.0 × 10−2
  3. C.2.0 × 10−1
  4. D.5.0 × 10−3
Show the answer and explanation

Answer: A (4.0 × 10−3)

Explanation

(2.5 × 10³)/(6.25 × 10⁵) = 0.4 × 10⁻² = 4.0 × 10⁻³.