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JAMB Mathematics 1979 Question 2

Question 2

Fractions, Decimals and Approximation

(1.28 × 104) ÷ (6.4 × 102) equals

  1. A.2 × 10-5
  2. B.2 × 10-1
  3. C.2 × 100
  4. D.2 × 101
  5. E.2 × 105.
Show the answer and explanation

Answer: D (2 × 101)

Explanation

1.28 ÷ 6.4 = 0.2 and 10⁴ ÷ 10² = 10², so the answer is 0.2 × 10² = 20 = 2 × 10¹.