# Is negative 5.7 a rational number?

Further, any decimal fraction, which limits itself beyond the decimal point (such as $5.7$ which does not go beyond tenth place) or has continuously repeats numbers (till infinity) beyond a certain place of decimal (such as $4.33333 \ldots .$ or $0.232142857142857142857 \ldots .$) can be easily written as ratio of integers, however large and hence are rational.
Now as $- 5.7 = - \frac{57}{10} = \frac{- 57}{10}$, a ratio of two integers, it is a rational number.