Yes, it is.
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Yes, 1 over 2 is a rational number. A rational number is any number that can be expressed as a fraction where the numerator and denominator are both integers. In this case, 1 over 2 is the fraction 1/2, which meets the criteria of being a rational number.
Yes.
.4/.8 is the same as 1/2 which is a rational number
Yes
Rational
The rational number -4 can be expressed as -4/1 or -8/2 or -12/3, and so on.