86499.99... to the nearest thousand
86049.99... to the nearest hundred
86004.99... to the nearest ten etc
Personally, I would advise that 86500 is rounded down to 86000 so as to avoid rounding bias but to many school teachers rounding bias is too complicated to explain to youngsters.
85500
85500 to the nearest thousand.
249999
25549
7.649
85500
85500 to the nearest thousand.
It depends on what basis you use for rounding. If you round to the nearest thousand, then 86,499.99999... is the largest possible number. If you round to the nearest multiple of 86,000, then 128,999.999... would be the largest number.
9.74999999999999999999.....
15499
9.1449
249999
25549
7.649
9.749
7.774999...
15549.99...