fx-82MS fx-82TL
d/c
On a Casio calculator you can generate an improper fraction
SHIFT d/c a b/c
Example 1
To convert 2.75 to the improper fraction
2.75
2.75SHIFT d/c 2.75
11┘4.2 • 7 5 = a b/c
and to convert it to the mixed fraction 
press
2.75
2┘3┘4.a b/c
The conversion can take as long as two seconds.
Exemple 2
To convert the mixed fraction 2 ½ in the improper fraction 5/2 and convert this also in the decimal value 2.5
SHIFT d/c 2┘1┘2
5┘2.2┘1┘2
2.52 a b/c 1 a b/c 2 = a b/c a b/c