[3(2/5)]
Convert mixed fraction into improper fraction,
= [3(2/5)] = (17/5)
Dived the numerator by the denominator till a nonzero remainder is obtained.
Put a decimal point in the dividend as well as in the quotient.
Put a zero on the decimal point in the dividend as well as on the right of the remainder.
Divide again just as we do in whole numbers.
Repeat the steps 3 and 4, till the remainder is zero.

∴ (17/5) = 3.4