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Determine whether the last digit of fraction is in tenths digits or so on,if you determine the last digit,then copy the number and replace the (last digit name)as the denominator
First, change decimal to percentage.
To change it, just multiply by 100.
Ex: 1.80 x 100 = 180%

Then, convert percentage to fraction.
Just divide it by 100.
Ex: 180% = 180/100
               = 1.8 or 1 4/5 (divide 4 by 5 = 0.8+1 = 1.8) ^_^