The number is already rounded to exactly that degree!
300
It is then 300 rounded to the nearest hundred because 50 rounds up to 100
Well, honey, 271 rounds to 270 when rounding to the nearest ten. If you're looking to round to the nearest hundred, then 271 rounds up to 300. So, there you have it, darling!
300
300
349 rounds to 300
300
250 all the way to 349
300
822
To the nearest ten, 949 rounds to 950 To the nearest hundred, 949 rounds to 900
To the nearest hundred, 28.75 rounds to zero. To the nearest hundredth, 28.75 rounds to 28.75