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The following are two possible breakdowns. Positive, zero and negative. Integer, fraction and mixed.
Because they can be expressed as a fraction
When the sum of the negatives is an integer is when the sum is a whole number
Because they can be expressed as fractions
It is a rational fraction: eithera proper fraction such as 2/3,an improper fraction such as 4/3 ora mixed fraction, such as 1 1/3.Or it can be the negative of any one of the above.