An improper fraction is where the numerator (number on top) is greater than the denominator (number on bottom). Your fraction 12/18 is proper, but it is not simplified. The simplified form is 2/3, which in decimal is 0.66666....
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18/12 is an improper fraction. It's equivalent to the mixed number 1.5 .
52/18 = 26/9
As an improper fraction - it would be 18 fifths (18/5)
3 3/5
6/18