When we round to the tenths place we have to look at the hundredths place (2 places after the decimal to determine whether we round or not)
2.839 3 < 5 so leave it alone 2.8
2.764 6 > 5 so round up 2.8
36.89 9 > 5 so round up 36.9
1,534.739 3 < 5 so leave it alone 1534.7