845 rounded to the nearest hundred is 800. This is because the value in the tens place "4" is less than 5.
500
845 rounded to the nearest hundred is 800. Rounded to the nearest 10 is 850
0
3571000
3600
800
840
80,000 is already rounded to the nearest hundreds.
500
845 rounded to the nearest hundred is 800. Rounded to the nearest 10 is 850
0
0
3571000
2600
6600
3600
4300