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Q: Find the least number which must be added to the number 6412 to get a perfect square.
  • A. 149
  • B. 129
  • C. 181
  • D. 150
Correct Answer: Option A - (80)² = 6400 (81)² = 6561 Hence on adding 6561 – 6412 = 149, 6412 will be the perfect square.
A. (80)² = 6400 (81)² = 6561 Hence on adding 6561 – 6412 = 149, 6412 will be the perfect square.

Explanations:

(80)² = 6400 (81)² = 6561 Hence on adding 6561 – 6412 = 149, 6412 will be the perfect square.