81. If $$\sqrt 6 = 2.449{\text{,}}$$ then the value of $$\frac{{3\sqrt 2 }}{{2\sqrt 3 }}$$ is = ?
82. If $$\sqrt 5 = 2.236{\text{,}}$$ then the value of $$\frac{{\sqrt 5 }}{2} \, - $$ $$\frac{{10}}{{\sqrt 5 }} \, + $$ $$\sqrt {125} $$ is equal to = ?
83. If $${\text{ }}2*3 = \sqrt {13} $$ and 3 * 4 = 5, then the value of 5 * 12 is ?
84. The least perfect square number divisible by 3, 4, 5, 6 and 8 is = ?
85. The least number by which 294 must be multiplied to make it a perfect square, is = ?
86. What is the least number which should be subtracted 0.000326 in order to make it a perfect square = ?
87. What is the least number to be added to 7700 to make it a perfect square ?
88. The smallest number to be added to 680621 to make the sum a perfect square is = ?
89. The greatest four digit perfect square number is = ?
90. The least number of 4 digits which is a perfect square is = ?
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