3.125 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 3125/1000 which simplifies to 25/8.
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To write 3.125 as a fraction in simplest form, first note that the decimal can be written as a mixed number as 3 1/8. To convert the mixed number to a fraction, multiply the whole number (3) by the denominator (8) and add the numerator (1) to get 25. The fraction is then 25/8, which is already in simplest form.
0.409 as a fraction in the simplest form is 409/1000
It is: -0.075 = -3/40 as a fraction in its simplest form
-0.258 as a fraction in its simplest form is -129/500
0.4 as a fraction in its simplest form is 2/5
148 written as a fraction in simplest form is 148/1