Negative numbers can be rational but not all negative have to be rational. It all depends if they can be put into a fraction.
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Yes - all numbers that can be written as ratios, even negative numbers, are rational numbers.
When the numbers are negative
Some definitions maintain that the set of whole numbers does not include negative numbers. That makes -12 an integer and rational.
Yes. Real numbers include positive and negative numbers, integers and fractions, rational and irrational numbers.
Yes - any integer, whether positive or negative, is rational. Rational numbers are defined as those which can be expressed as a ratio or non-recurring fraction or decimal.