.78
.78
7/8 is in simplest form. As a decimal, 7/8 = 0.875
It is: 78 and 1/2 = 78.5
The number is already in decimal form!
78
2 7/8 = 2.875
It is 78. There is no need for a decimal point after the number and it would be wrong to write it as 78.0 since that would suggest a level of accuracy that is not justified.
78/125
x.xxx 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 78/100 which can be simplified to 39/50.
.78
0.0256