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JAMB Mathematics 1986 Question 4

Question 4

Fractions, Decimals and Approximation

Find the smallest number by which 252 can be multiplied to obtain a perfect square.

  1. A.2
  2. B.3
  3. C.5
  4. D.7.
Show the answer and explanation

Answer: D (7.)

Explanation

252 = 2² × 3² × 7. Only the 7 is unpaired, so multiplying by 7 gives a perfect square (1764 = 42²).