61. The value of $$\sqrt 2 $$ up to three places of decimal is = ?
62. If $$3\sqrt 5 + \sqrt {125} = 17.88{\text{,}}$$ then what will be the value of $$\sqrt {80} $$ $$ + $$ $$6\sqrt 5 $$ = ?
63. Given $$\sqrt 2 = 1.414.$$ Then the value of $$\sqrt 8 $$ $$ + $$ $$2\sqrt {32} $$ $$ - $$ $$3\sqrt {128} $$ $$ + $$ $$4\sqrt {50} $$ is = ?
64. The approximate value of $$\frac{{3\sqrt {12} }}{{2\sqrt {28} }}$$ $$ \div $$ $$\frac{{2\sqrt {21} }}{{\sqrt {98} }}$$ is ?
65. $$\sqrt {110.25} \times \sqrt {0.01} \, \div $$ $$\sqrt {0.0025} $$ $$ - $$ $$\sqrt {420.25} $$ equals ?
66. $$\sqrt {\frac{{0.081 \times 0.484}}{{0.0064 \times 6.25}}} {\text{ }}$$ is equal to ?
67. The value of $$\sqrt {\frac{{{{\left( {0.03} \right)}^2} + {{\left( {0.21} \right)}^2} + {{\left( {0.065} \right)}^2}}}{{{{\left( {0.003} \right)}^2} + {{\left( {0.021} \right)}^2} + {{\left( {0.0065} \right)}^2}}}} $$ is ?
68. The square root of $$\left( {7 + 3\sqrt 5 } \right)$$ $$\left( {7 - 3\sqrt 5 } \right)$$ is ?
69. $${\left( {\sqrt 3 - \frac{1}{{\sqrt 3 }}} \right)^2}$$ simplifies to ?
70. If $$a = 0.1039{\text{,}}$$ then the value of $$\sqrt {4{a^2} - 4a + 1} $$ $$ + $$ $$3a$$ is ?
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