Round 2.34 to the nearest tenth?

the anwer is 2.3 because when is 1,2,3,4 you don't chage anything and livit the same and make it 0.Also if is from 5,6,7,8,9 you go up 1 and make the number you have rounded of 1,2,3,4,5,6,7,8,9 a 0