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]7,7\fbox82\approx\boxed{\boxed{7,800}}\\-------------\\\boxed8\geq5 \to round\ the\ number\ up[/tex]