5000
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4500
4500
Smallest when rounded: 4500 Smallest when rounded down: 5001
Half of 1000 is 500, so numbers in the range 5000 ± 500 round to 5000 to the nearest 1000 EXCEPT that numbers exactly half way round up. ie numbers greater than or equal to 5000 - 500 = 4500 and less than 5000 + 500 = 5500 will round to 5000 to the nearest 1000. So the largest whole number that rounds to 5000 to the nearest 1000 is 5500 - 1 = 5499.
1000