Technically, it's closer to neither, but as a rule of rounding, if it's halfway, you roué up, so you would round it to 500.
400
500
500
500 to the nearest 100 = 500
The hundreds, on either side of 449 are 400 and 500. 449 is 49 away from 400, and 51 away from 500. So the nearest hundred is 400.
400
500
400
It is 500.
500
400
450 to 549
500 to the nearest 100 = 500
It is 450.
The hundreds, on either side of 449 are 400 and 500. 449 is 49 away from 400, and 51 away from 500. So the nearest hundred is 400.
400
400
400
500
Round it up to 500.