The first page of the problems file contains the rules. Read them carefully!

Round 1 Problems
Solutions: Problem 1 -- Problem 2 -- Problem 3 -- Problem 4 -- Problem 5
Round 2 Problems
Solutions: Problem 1 -- Problem 2 -- Problem 3 -- Problem 4 -- Problem 5
Round 3 Problems
Solutions: Problem 1 -- Problem 2 -- Problem 3 -- Problem 4 -- Problem 5
Round 4 Problems
Solutions: Problem 1 -- Problem 2 -- Problem 3 -- Problem 4 -- Problem 5

Remember to fully justify all your answers - don't just send numerical answers.

You can also check out past USAMTS problems.