0.0064 = 64/10000 = 4/625
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In its simplest form the decimal of 0.65 as a fraction is 13/20
A number expressed in decimal form usually is a fraction. It is simply a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. And, since it is a decimal fraction, there is not another simpler decimal form.
6.9 is a decimal fraction and, being a decimal representation, it IS in its simplest form. The equivalent rational fraction is simplest form is 69/10.
35/1
-0.312 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, since it is a decimal fraction, there is not another simpler decimal form. Its equivalent, in rational form, is -312/1000 which simplifies to -39/125.