Mike J answered First, you need to change 12.05 to a fraction. To do this, say the number in your head."Twelve and five hundredths."This tells you the whole number is 12, and the fraction is 5/100.Now, you need to simplify 5/100. Divide both 5 and 100 by 5, and you can simplify the fraction to 1/20. Your simplified mixed number is 12 and 1/20.