0.66 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 66/100 = 33/50. Simplification does mean that you lose information about the precision of the fraction.
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066 = 66 is an integer and not a fraction. However, it can be expressed in rational form as 66/1. You can then calculate equivalent rational fractions if you multiply both, its numerator and denominator, by any non-zero integer.
66/1
6.6%/100 = .066
.066 meter
.066 or 35/528th