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All repeating decimals are rational numbers. Not all rational numbers are repeating decimals.
Repeating decimals are ALWAYS rational numbers.
Yes, negative decimal numbers are rational, as long as it is terminating or repeating.
yes, repeating decimals (those that have infinite - never ending - number of digits after the decimal point and these decimals show repeating pattern) are rational numbers, because they can be written as fractions.
All decimals that terminate, or end with a repeating set of digits are rational numbers. eg 1.234, 1.222..., 1.232323..., 1.23444..., 1.2343434... are all rational numbers.