2545 to 2554 -- ten of them.
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6500 to 7499 -- 1000 numbers
When rounding off, the rule is, "If the first figure to be discarded is 5 or more then the previous figure is increased by 1. Following this rule then 650 is the result of rounding off numbers in the range 645 to 654. As 650 itself is not rounded off then there are 9 whole numbers that can be rounded to 650.
500
It depends on whether you are rounding to the nearest integer, nearest 10, nearest 50 etc.
600 of them. Any number from 300 tp 899 (inclusive), to the nearest 600.