Zero
It is 0.
372 rounded to the nearest 100 is 400.
372 rounded to the nearest hundred is 400
372 is an integer and so is already rounded to a tenth.
370
400
853 rounded to the nearest 100: 900. 10853 rounded to the nearest 100: 10900.
100
600
100
100
0
555 rounded to the nearest 100 is 600.