2.54 is pronounced two and fifty four hundredths so u would write it exactly as u hear it. 2, and 52 over 100. So, 2.54 is 2 and 54/100. This can be simplified to 2 and 27/50. 3.750 is the same as 3.75 so it is pronounced three and seventy five hundredths. Same as the other example, this is 3 and 75/100. This can be simplified to 3 and 3/4 because both 75 and 100 can be divided by 25.