1.8 is 1 whole and 8 tenths.
So 1.8 = 1 8/10
Or simplified as 1 4/5.
This can also be written as an improper fraction: 18/10 = 9/5
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18/1
In fraction form: 18/5 In simplest form: 3 3/5
1.6667
18% = 18/100 = 9/50 in its simplest form
18/5