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What is a shortcut for finding the sum of all numbers from 1-99?

  • Math -

    There is quite the easy shortcut for adding any set of numbers from 1 to whatever and that is this:

    (n(n+1))/2

    So, let's say you wanted to find the sum of all numbers from 1 to 99. 99 will be n and so the equation will look like the following:

    (99(99+1))/2

    Solve for the top first:

    9900/2

    Finish the solution:

    9900/2 = 4950

    And there you go, you can use and number greater than one as your n.

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