Since the ones digit in 876212 is less than 5, the number is rounded down to the nearest 10 and becomes 876210.
10 because 8 is to small to have this and 10 is the first ten there is
10
Rounded to the nearest ten it is 10 but rounded to the nearest tenth it is 12.6
10
730
Since the last digit is over 5, than you round up to 730.
60
You would round it down... to 80.
Zero.
89030
7480
Since the ones digit in 876212 is less than 5, the number is rounded down to the nearest 10 and becomes 876210.
300
8 is already rounded to the nearest 10th. Rounded to the nearest 10 is 10.
It would be rounded to 60 if you're rounding to the nearest 10.
60 1,2,3,4 is rounded down 5,6,7,8,9 is rounded up