How do you round 5.72 to one decimal place?

you take the 2nd decimal and if it is under 5 you take out the 2nd decimal and leave the 1st decimal the way it is, if the 2nd decimal is 5 and over you add 1 to the 1st decimal with 5.72 it will change to 5.7 but if it was 5.77 it would change to 5.8