SOLUTION: is -0.685 a rational or irrational number? I think that it is rational, but i'm not so sure about negative numbers.

Algebra ->  Algebra  -> Polynomials-and-rational-expressions -> SOLUTION: is -0.685 a rational or irrational number? I think that it is rational, but i'm not so sure about negative numbers.      Log On

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Question 5854: is -0.685 a rational or irrational number?
I think that it is rational, but i'm not so sure about negative numbers.
Answer by ichudov(499) About Me  (Show Source):
You can put this solution on YOUR website!
Yes, it is rational. Rational numbers are positive and negative numbers that can be expressed as a fraction.
-0.685 is -685%2F1000, a fraction, so it is rational.
Any decimal numbr with limited number of digits is rational. Even some decimal numbers with infinite amount of digits are rational, if the digits form repeating pattern. For example,
0.333333333333+=+1%2F3