If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up (+1).
If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down (no change).
[tex]9.92\approx9.9\\3.99\approx4\\2.14\approx2.1\\8.39\approx8.4\\2.79\approx2.8\\8.48\approx8.5\\2.96\approx3\\5.34\approx5.3\\4.52\approx4.5[/tex]