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You use a negative rational number when an answer is below zero.

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Q: When do you use a negative rational number?

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It is the positive value of that rational number.

Any rational positive number is still rational when you make the same number negative.

It is the smallest non-negative rational number. Negative numbers are rational and are smaller.

It is a negative number. It is also a rational number; also, it's a real number.

-16.987 is a rational number

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You use a negative rational number when an answer is below zero.

Anywhere where negative quantities exist.

It is the positive value of that rational number.

Negative three is a rational number.

No, -5 is a negative, rational number.

Any rational positive number is still rational when you make the same number negative.

It is the smallest non-negative rational number. Negative numbers are rational and are smaller.

The negative of a rational number is also rational.

It is a negative number. It is also a rational number; also, it's a real number.

If its positive version is rational then it is rational and if not, it is not.

-16.987 is a rational number

Negative 1 is a rational number. It is an integer (though not a counting number) and all integers are rational.