It is already rounded to the nearest 10 as 780
780
780
780.00
780
780
The number 780 is already rounded to the nearest tenth.
780
If we round $776 to the nearest $10, that is $780. Note that you only need to increase $776 by $4 to get to $780, but you would need to decrease it by $6 to get to $770. That's why this amount is nearer to $780 than to $770.
710
Rounded off to the nearest ones is 775, rounded off to the nearest tens is 780, rounded off to the nearest one hundreds is 800.
791 rounded to the nearest 10 is 790
780