The correct expression of $6.\overline{46}$ in the fractional form is

Write down the following quotients in descending order:
$1.$ $\frac{368.39}{17}$
$2.$ $\frac{170.50}{62}$
$3.$ $\frac{875.65}{83}$

If $\frac{1}{\sqrt{a}} - \frac{1}{\sqrt{b}} = 0$,then the value of $\frac{1}{a} + \frac{1}{b}$ is

The unit's digit of the number $6^{256} - 4^{256}$ is

Find the smallest fraction which when added to $\frac{2}{5} \times \frac{15}{21} \times \frac{7}{10} \times \frac{3}{8}$ gives a whole number.

If $\frac{1}{6.198} = 0.16134,$ then the value of $\frac{1}{0.0006198}$ is