8 is an integer. Integers aren't fractions or mixed numbers. You can write 8 as 8/1 or 7 and 4/4, but it wouldn't be in simplest form. The simplest form of any integer is the integer itself.
4.75 as a mixed number with a fraction in simplest form = 43/4
mixed fraction
As a mixed number in its simplest form: 1 and 37/50 As an improper fraction in its simplest form: 87/50
4.875 in simplest form as a mixed number = 47/8
As an improper fraction in its simplest form 2.45 is 29/20 As a mixed number in its simplest form 2.45 is 2 and 9/20
0.375 is 3/8 as a fraction in its simplest form
168 is an integer, not a fraction nor mixed number.
283 is an integer, not a mixed number or fraction.
116 percent as a fraction or mixed number in simplest form = 29/25 or 14/25
150 is an integer: it is neither a fraction nor a mixed number. It can be expressed in the form of a rational fraction as 150/1 which is the simplest form. However, there is no sensible way to express it as a mixed number.
As a fraction in its simplest form 0.545 = 109/200
As a fraction in its simplest form 0.428 = 107/250