23.9
is
23 and 9/10
so, an improper fraction
(10*23+9)/10
= 239/10
----------------------simplest form
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5.478 written as a mixed number is 5 and 239/500 in its simplest form
2.39
0.478 = 478/1000 = 239/500
239/1000
239 is a prime number.