0.3878 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 3878/10000. You can simplify this rational fraction if required.
Write as a fraction in simplest form
It is as a fraction in its simplest form: 11/16
0.196 as a fraction in simplest form is 49 ------ 250
0.32 as a fraction in simplest form = 8/25
0.84 as a fraction in simplest form = 21/25
3.1818 as a fraction in simplest form = 15909/5000
0.31 as a fraction in simplest form = 31/100
-0.45 as a fraction in its simplest form is -9/20
It is: -0.075 = -3/40 as a fraction in its simplest form
0.70 = 7/10 as a fraction in its simplest form
0.3 = 3/10 as a fraction in its simplest form
0.25 = 1/4 as a fraction in its simplest form