-1.64 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 -164/100 which can be simplified to -41/25 but by simplifying you lose much information about the accuracy of the number.
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75/164 is in its simplest form.
62/164 can be simplified to 31/82 but no further.
16.4 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. Its equivalent, in rational form, is 164/10. You can simplify this rational fraction if you require.
As an improper fraction in its simplest form it is 77/5
It is:-76/25 as a fraction in its simplest form