12/5 an improper fraction = (5*1 + 2)/5 = 7/5.
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2 can be written as 10/5 or ten fifths. Add one fifth (1/5) and you get 11/5 or eleven fifths.
There isn't one. You can only make an improper fraction from a mixed fraction, which a whole number with a fraction on its side
To make 4.3 into an improper faction, you simply put it over one. so, 4.3/1. So that it comes out nice and with no decimals, we can change this fraction to 43/10.
5/4
6 and 1/3 as an improper fraction is 19/3