6.3 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 63/10 or 6 3/10 which cannot be simplified.
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63% = 63/100 = 0.63
63/200
63% can be written as 63/100, which is the simplest form because neither 63 nor 100 have an equivalent prime factor.
You would have to round the repeating decimal to the nearest fraction, which is 63/100. It would be 1 63/100. It is in simplest form.
63/100 is the simplest fraction that can represent exactly .63. It cannot be reduced.