Convert fraction $\frac{142}{86}$ into simplest form.

The given fraction is $\frac{142}{86}$.

H.C.F. of 142 and 86 is 2.

then, $\frac{142}{86}=\frac{142÷2}{86÷2}=\frac{71}{43}$.

Therefore, the simplest form of the given fraction is $\frac{71}{43}$.