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 ?

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