I'm just telling you this ahead of time...but i'm not 100% sure with this answer..:
fractions belong in the Rational Numbers
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Irrational Numbers which are a subset of Real Numbers which are a subset of Complex Numbers ...
Rational (ℚ) which is a subset of Real (ℝ) which is a subset of Complex (ℂ).
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Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction. Not all real numbers are rational.
-4.2 is a negative decimal number. It is also a directed number.