Rules
Four Fours, the combinatorial maths challenge.
Education Suggestions
Write to the author.
Solutions 0-100
A list of the first 100 answers (solutions 0 to 99) to the Four Fours problem.
Solutions 101+
A list of contributed answers (solutions above 99) to the Four Fours problem - there are some gaps.
Submit a Solution
If you can contribute a solution where we have none, then submit it here!
Resources
Links to other web pages dedicated to the Four Fours problem.