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The Problem of the Month is intended to challenge enthusiastic high school math students. Most problems are designed with the assumption that students attempting them have a solid understanding of grade 11 math, but some problems may still be of interest to motivated younger students.
A new problem will be posted on the first Tuesday of every month starting in October. A hint will follow 10 days later, and a solution another 10 days after that.
April  Problem 7 Solution

The Problem of the Month is designed to be considerably more difficult than Problem E of Problem of the Week. These problems may be useful for students who:
We hope you are challenged by the Problem of the Month! Here a few things to keep in mind:
We hope these problems will encourage you to think about something new!
September  October  November 
December  January  February 
March  April  May 
September  October  November 
December  January  February 
March  April  May 
September  October  November [Resources] 
December  January  February 
March  April  May 
The booklets containing all the problems from 20202021, 20212022, and 20222023 Problem of the Month are linked below. The problems are organized by date they appeared.
The booklets containing all the problems, hints and solutions from 20202021, 20212022, and 202223 Problem of the Month are linked below. The problems are organized by date they appeared.