549 rounded to the nearest hundred is 500.
500
549 and 450 rounded off the nearest hundred is 500
500
549 to the nearest hundredths place is 549.00
549 rounded to the nearest hundred is 500.
500
It is 549.
450 to 549
549 and 450 rounded off the nearest hundred is 500
500
549 to the nearest hundredths place is 549.00
549 rounded to the nearest ten is 550
500
The largest integer that, when rounded to the nearest hundred, would round to 500, is 549.
549 to the nearest thousands is 1,000.
I am not quite sure what you mean by the "lowest hundred" (or lowest hunderd, even). To the nearest hundred, it would be 549.99... recurring.