1985 AJHSME Problems/Problem 2
We could just add them all together. But what would be the point of doing that? So we find a slicker way.
We find a simpler problem in this problem, and simplify ->
We know , that's easy - . So how do we find ?
We rearrange the numbers to make . You might have noticed that each of the terms we put next to each other add up to 10, which makes for easy adding. . Adding that on to 900 makes 945.