600 of them. Any number from 300 tp 899 (inclusive), to the nearest 600.
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There are 90 two-digit whole numbers between 1 and 100.
-21
6500 to 7499 -- 1000 numbers
18
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.