It is not possible to right 9 tenths as an improper fraction because it is not a whole number.
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89/10
7/2
3 9/10
To write 9 and 4/5 as an improper fraction, first multiply the whole number (9) by the denominator (5), which is 45. Then add the numerator (4) to get 49. Finally, write 49/5 as the improper fraction.
It is 23/9.