Look at the digit in the ones place. It is a 7. That will round up the number, so will increment the 6, giving 870 as the result.
1.54
80.948 rounded to the nearest ten is 80. When rounding, we look at the digit in the ones place, which is 8. Since 8 is 5 or greater, we round up, but since we are rounding to the nearest ten, we stay at 80.
63546 rounded to the nearest ten is 63550.
590
900
It's already there.
Zero
It is: 0.6
600
600
It is 80.9
360
2.9
1.54
It is: 8
1530 1530
10