All repeating decimals are rational numbers. Not all rational numbers are repeating decimals.
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No. A rational number is any terminating numeral. A repeating decimal is irrational.
No. It is a rational number. Any repeating decimal or terminating decimal is rational.
Always
Yes, it is a repeating decimal. Terminating and repeating decimals are rationals. Rational numbers can also be expressed as a fraction. 0.313131 is a repeating decimal.
A number with a finite number of decimal digits is always rational. (If the number of decimal digits is infinite, the number is rational only if there is a repeating pattern.)