680.
When you round a number it means to make it to the nearest of what is asked.
Ie. Rounding 8 to the nearest 10 would be 10. Rounding 1249 to the nearest 1000 would be 1000.
680
7,682,300 rounded to the nearest 1,000 is 7,682,000.
700
60
700
It is then 740 when rounded to the nearest ten.
36,184 rounded to the nearest ten thousands place is 40,000.
6512162 rounded to the nearest ten is 6512160.
320
2602 rounded to the nearest ten is 2600.
Rounded to the nearest ten it is: 564,630
260