What is the least number to be subtracted from 990 to make it a perfect square?	Choose the correct choice from the following:
A) 100
B) 90
C) 30
D) 71
E) 80
The numbers less than 990 and are squares of certain number is 900.   The least number that should be subtracted from 990 to make it perfect square = 990 - 900= 
<gadget id="calculator">990 - 900</gadget>
<output>90</output>
90.   ANSWER:90
<result>B</result>
What is the least number to be subtracted from 990 to make it a perfect square?