### Home > CCA2 > Chapter 10 > Lesson 10.1.4 > Problem10-63

10-63.

Use any method to find the sum of the integers from $100$ through $1000$. Describe your strategy.

$1000 + 100 = 1100$
There are $901$ integers between $100$ and $1000$, inclusive.

Substitute these numbers into the formula:

$\frac{901(1000+100)}{2}$

$495{,}550$