The correct expression of 6.$\overline{46}$ in the fractional form is:
$ \dfrac{646}{99} $
$ \dfrac{64640}{1000} $
$ \dfrac{640}{100} $
$ \dfrac{640}{99} $
Explanation:
6.$\overline{46}$ = 6 + 0.$\overline{46}$ = 6 +$ \dfrac{46}{99} $ =$ \dfrac{594 + 46}{99} $ =$ \dfrac{640}{99} $.