The sum is 2500.
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If you can count from 1 to 100, then you can name them all. (And in numerical order, I might add.)
Add them up. 90, 91, 92, 93, 94, 95, 96, 98, 99, 100
100
All numbers from 1 to 100 which are whole numbers are integers
All you do is add all of the numbers 3 times and 1 an 9 4 times