What is the square root of 0.09 ?

The value of   $$ {(0.03)^2 - (0.01)^2}\over 0.03-0.01 $$

Direction : What value should come in the place of question mark (?) in the following questions?

80% of 10% of 340 = ?

Direction : What value should come in the place of question mark (?) in the following questions?

125% of 2440 – 75% of 1856 = ?

The value of $${\sqrt{40+\sqrt{9\sqrt{81}}} }$$ is

If the sum and difference of two number are 20 and 8 respectively, then the difference of their squares is: 

The number, whose square is equal to the difference between the squares of 975 and 585, is: 

Which smallest number must be added to 2203 so that we get a perfect square?