Here, we will not only tell you what the sum of integers from 1 to 9999 is, but also show you how to calculate it fast. The sum of the integers from 1 to 9999 is 49,995,000.
To get the answer above, you could add up all the digits like 1+2+3... +9999, but there is a much easier way to do it! Use the following formula:
n(n + 1)/2 = Sum of Integers
In this case, n=9999, thus you get your answer by entering 9999 in the formula like this:
9999(9999 + 1)/2 = 49,995,000
Sum of Integers Calculator
To get the sum of integers from 1 up to another number, please enter that other number here: