It is seventy-eight and nine tenths.
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0.789 = 789/1000
64
1.578 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 1578/1000 which simplifies to 789/500..
1, 3, 263, 789.
0.0292