Yes because it can be expressed as a fraction
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0.6875 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. And, being a decimal, there is no simpler form. Its rational equivalent is 6875/10000 which can be simplified to 11/16.
1, 5, 11, 25, 55, 125, 275, 625, 1375, 6875.
11/16
4.6 is rational.
No, it is rational.