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WAEC Mathematics 1988 Question 1

Question 1

Fractions, Decimals and Approximation

Evaluate (101.5)2 − (100.5)2

  1. A.1
  2. B.2.02
  3. C.20.02
  4. D.202
  5. E.2020
Show the answer and explanation

Answer: D (202)

Explanation

Use the difference of two squares: (101.5 − 100.5)(101.5 + 100.5) = 1 × 202 = 202.