What is the square root of 261,121? Answers.
A) 476 B) 489 C) 497 D) 511 E) 524
1) Checking the last digits in the answer options A, C, E are out since last digit of the square is known to be 1.   2) B = 489^2 and D = 511^2   B = (500-11)^2 and D = (500 + 11)^2   Since we need the answer less than 250000 =&gt; B is out.   Thus we have 511 as the ans.
<result>D</result>
What is the square root of 261,121?