0.4 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 rational equivalent is 4/10 which can be simplified to 2/5.
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0.5 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 5/10 which can be simplified to 1/2.
-0.25 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 -25/100. You can simplify this rational fraction if you so wish.
If you know how to turn a mixed number into a fraction and a fraction into a decimal do that then make it negative.
36/125
0.8 as a fraction is 8/10 or 4/5 in its simplest form