The number is already rounded to exactly that degree!
300
300
It is then 300 rounded to the nearest hundred because 50 rounds up to 100
300
300
349 rounds to 300
300
250 all the way to 349
822
300
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