-6.4 = -(6 and 4/10) = -(6 and 2/5) = -(32/5)
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If the numerator is negative and the denominator is positive then the fraction will be negative. If the numerator is negative and the denominator is negative too then the fraction will be positive.
Expressed as a proper fraction in its simplest form, -2-6 = -1/64 or minus one sixty-fourth. Expressed as a decimal, this is equal to -0.015625.
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64 is an integer and not a fraction. However, it can be expressed in rational form as 64/1.
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