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.
8000
85000 and 94999
Any number in the interval [29500, 30500].
I believe the answers are 165,000 and 174,999
6000
70
45 to 54
To solve this, you have to consider what the largest and smallest numbers could be to cause the ten thousand's place to round to a 0.404,444 is the largest, because if you round to the ten thousand's place, it will still be 400,000. If any of the 4s becomes a 5, it will round up to 410,000.394,445 is the smallest, because if you round to the ten thousand's place, it will round up to 400,000
350 to 449