The answer is 55. A mathematical formula for solving this problem would be n(n+1)/2, where n is the largest natural number that you wish to sum. In this case, n=10. Of course, if you are using a computer program like MS Excel, you can always use the SUM function.
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Just add 1 + 2 + 3... etc.,
The sum of the squares of the first 100 natural numbers [1..100] is 338350, while the sum of the first 100 natural numbers squared is 25502500.
20100
1 1 1
11