As the digit in the tens position is a 5, it is rounded up to give 300.
360
ac
300
300
That depends on what you want as your rounding. For example, to the nearest 10, it would be 260 and to the nearest 100 it would be 300.
To the nearest ten, 260
round 90 to the nearest ten
372 rounded to the nearest hundred is 400
300
2,222 rounded to the nearest 100 is 2,200.
100
100
100
10100
100
4198 to the nearest 100 = 4200