300
297 rounded to the nearest hundreds place is: 300. This is because the tens value "9" rounds up. When rounding any number equal to or greater than 5 rounds up and everything else rounds down.
It is: 300
297 rounded off to the nearest tenths place is 297.0
80,000 is already rounded to the nearest hundreds.
500
0
0
3571000
2600
6248000
6600
3600
4300
4800