3760
3756 to the nearest 1000 is 4000. When rounding to the nearest 1000, you look at the hundreds place of the number in question. Since the hundreds digit in 3756 is 5, you round up to the next thousand, making it 4000.
853 rounded to the nearest 100: 900. 10853 rounded to the nearest 100: 10900.
100
100
0
555 rounded to the nearest 100 is 600.
97 rounded to the nearest hundred is 100. 97 rounded to the nearest ten is 100
100
100
100
0