The wording of this question seems confusing. 5700 rounded to the nearest thousand would be 6000. So you appear to be looking for the largest and smallest whole numbers that would round to 6000.
The smallest number would be 29500. The largest number would be 31499.
25000
2499
85 and 94
The smallest number that is 600 when rounded to the nearest hundred is 550. The largest number that is 600 when rounded to the nearest hundred is 649.
29500 to 30499
5500 to 6499
The smallest number would be 29500. The largest number would be 31499.
85000 and 94999
8000
I believe the answers are 165,000 and 174,999
Any number in the interval [29500, 30500].
45 to 54
70
6000
25000
350 to 449