What is 990*990?	Answers:
A) 974,169	B) 974,219	C) 974,549	D) 980,100	E) 985,369
if you take a base of 1000 then 990 is 10 less than 1000   to get the product of 990 x 990 write like this   990- 10( as 10 less than base1000)   990- 10   now 10 x 10 = 100   and  990-10= 
<gadget id="calculator"> 990-10</gadget>
<output>980</output>
980   so 990 x 990= 980100 ... (bingo the answer is D . you can even have a shortcut ...... 10 x 10 = 100... only answer choice has last three digits as 100.. so no need to calculate 990-10 . after you get 10 x 10 you can straight way pick answer choice 980,100.
<result>D</result>
What is 990*990?