Write it as 035, then take the tens as the number that you use to decide whether you round up or down. With it being three you will round down so the answer will be 0.
100
372 rounded to the nearest hundred is 400
300
To the nearest ten, 40
100
10100
0
The nearest hundred smaller than 365 is 300 which is 65 away. The nearest hundred larger than 365 is 400 which is 35 away. Therefore the nearest 100 is 400.
4198 to the nearest 100 = 4200
The answer is zero.
35
100.