To the nearest 100 it is zero. To the nearest hundredth, which may be what you meant, the 7 in the thousandths position will round up the 3 to give 4.14 as the answer.
409 to the nearest hundred is 400
548.48 rounded off the nearest hundred is 540.
3486 rounded off to the nearest hundred is 3500.
593 656 rounded off to the nearest hundred is 593 700.
833 rounded off the nearest hundred is 800.
10100
409,381,900
900
2,600
To the nearest hundred, 165400
It is 7300
3600