Assuming you start with three and nine tenths, you multiply the three by ten, add the nine and put the total over ten, getting 39 over 10 (which is very like the figure you began with so I may have got the wrong end of your stick.)
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Expressed as an improper fraction in its simplest form, 1.1 is equal to 11/10 or eleven over ten.
In order to change 4 9/10 into an improper fraction, you multiply 4 by 10 and add 9 which equals 49. Then you put 49 over 10 so the answer is 49/10.
No.
Yes.
an example of and improper fraction is um i don't know maybe 10 over 3 or 123 over 74