Infinitely many.
45 + 45, 46 + 44, 47 + 43, ... , 98 + 1, 99 + 0, 100 + (-1), 101 + (-2) and so on and on and on. Without an end in sight.
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An infinite number.
There are infinitely many pairs. For example 23.5 and 75.5 or -3 and 102.
If you include negative numbers, the list is infinite.
The sum of whole numbers 1 through 30 is 465.
The sum of the first five whole numbers is 10.