All five of them are rational.
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Oh, dude, .35 is a rational number because it can be expressed as a ratio of two integers. In this case, you can write it as 35/100, which simplifies to 7/20. So, like, .35 is totally rational because it's got a simple integer ratio hiding underneath its decimal disguise.
23
35 is an integer and not a fraction. However, it can be expressed in rational form as 35/1. You can then calculate equivalent rational fractions if you multiply both, its numerator and denominator, by any non-zero integer.
The fraction 23/35 is halfway. 3/5 = 21/35 5/7 = 25/35
61/2 - 27/8 = 13/2 - 23/8 = 52/8 - 23/8 = 29/8 = 35/861/2 - 27/8 = 13/2 - 23/8 = 52/8 - 23/8 = 29/8 = 35/861/2 - 27/8 = 13/2 - 23/8 = 52/8 - 23/8 = 29/8 = 35/861/2 - 27/8 = 13/2 - 23/8 = 52/8 - 23/8 = 29/8 = 35/8