140
To round to the nearest ten, look at the units number, in this case the 8. If the units is 5 or greater round the tens up, if 4 or less leave the tens as it is (known as round down).
For example if the number was 134, you would round down to 130.
360
140
140
140
150
60
It is then 740 when rounded to the nearest ten.
30
36,184 rounded to the nearest ten thousands place is 40,000.
2602 rounded to the nearest ten is 2600.
320
20
260
Rounded to the nearest ten it is: 564,630
5240
6512162 rounded to the nearest ten is 6512160.