Using your Head is Permitted

Welcome to the "Using your Head is Permitted" monthly math riddle page.

Links to past riddles and solutions are from this page. If you know any good riddles that you think might fit in, you're welcomed to send them to the puzzlemaster at riddlesbrand.scso.com. The puzzlemaster is Michael Brand.

September 2014 Riddle Solution Even More Jigsaw Puzzles
August 2014 Riddle Solution Balancing Rounded Irrationals
July 2014 Riddle Solution More Jigsaw Puzzles
June 2014 Riddle Solution The Missing Piece
May 2014 Riddle Solution Fun with Random Bits
April 2014 Riddle Solution 2048
March 2014 Riddle Solution Squares and Rectangles
February 2014 Riddle Solution On the Shoulders of Giants
January 2014 Riddle Solution Table-turning Genie
December 2013 Riddle Solution Christmas at MegaCorp
November 2013 Riddle Solution Parenthesis Values
October 2013 Riddle Solution King Tours
September 2013 Riddle Solution Rook Tours
August 2013 Riddle Solution Fun with L2
July 2013 Riddle Solution PSP
June 2013 Riddle Solution Horner's Dilemma
May 2013 Riddle Solution Coin Verification
April 2013 Riddle Solution k-resistance
March 2013 Riddle Solution A185028
February 2013 Riddle Solution More Takeaways
January 2013 Riddle Solution Take Away
December 2012 Riddle Solution A Problem with Neighbors
November 2012 Riddle Solution Fun with Normal Distributions
October 2012 Riddle Solution Rectangling Another Rectangle
September 2012 Riddle Solution Hydra Games
August 2012 Riddle Solution Euler Numbers
July 2012 Riddle Solution Stepping Contest
June 2012 Riddle Solution Lucky Numbers
May 2012 Riddle Solution Two Polygons
April 2012 Riddle Solution Natural Partitions
March 2012 Riddle Solution Rectangling the Rectangle
February 2012 Riddle Solution Space-efficient Exponentiation
January 2012 Riddle Solution From A to B
December 2011 Riddle Solution Post-office Tetrahedra
November 2011 Riddle Solution Post-office Volumes
October 2011 Riddle Solution Post-office Dilemma
September 2011 Riddle Solution Gladiators
August 2011 Riddle Solution Equinox Counting
July 2011 Riddle Solution Bananas
June 2011 Riddle Solution Improved FFT
May 2011 Riddle Solution Fun with Trigonometry
April 2011 Riddle Solution Cyclone Frogs
March 2011 Riddle Solution Lights-Out
February 2011 Riddle Solution Tea or Coffee
January 2011 Riddle Solution Prepostria
December 2010 Riddle Solution 2-bend Graph Embeddings
November 2010 Riddle Solution DNFs and Symmetric Functions
October 2010 Riddle Solution Abraham and Benjamin
September 2010 Riddle Solution Gloved Prisoners
August 2010 Riddle Solution Tetrahedron Crossing
July 2010 Riddle Solution A Tribute to Gardner
June 2010 Riddle Solution Cyclic Permutations
May 2010 Riddle Solution Segment-preserving Mappings
April 2010 Riddle Solution Self Assembled Numbers
March 2010 Riddle Solution Taylor Series
February 2010 Riddle Solution Laura Sort
January 2010 Riddle Solution Encyclopedia Sort
December 2009 Riddle Solution Dividing the Naturals
November 2009 Riddle Solution Polynomial Solutions
October 2009 Riddle Solution Local Minima
September 2009 Riddle Solution Pythagorean Triplets
August 2009 Riddle Solution Boolean Functions
July 2009 Riddle Solution Steiner Systems with k=3
June 2009 Riddle Solution Counting Solutions to x2+y2
May 2009 Riddle Solution Perfect Numbers
April 2009 Riddle Solution Counting Triangles
March 2009 Riddle Solution Fun with Uniform Distributions
February 2009 Riddle Solution O(1) Factorial
January 2009 Riddle Solution O(1) Sorting
December 2008 Riddle Solution O(n) Sorting
November 2008 Riddle Solution Combinations of 1s
October 2008 Riddle Solution
September 2008 Riddle Solution Permutation Reversal
August 2008 Riddle Solution Trisecting the Square
July 2008 Riddle Solution Sudoku
June 2008 Riddle Solution Knights of the Round Table
May 2008 Riddle Solution Permutation Partial Sums
April 2008 Riddle Solution Partial Harmonic Series
March 2008 Riddle Solution Lexicographic Sorting
February 2008 Riddle Solution Board Game Strategies
January 2008 Riddle Solution QCPL
December 2007 Riddle Solution One-to-one Functions
November 2007 Riddle Solution License Plate Numbers
October 2007 Riddle Solution Jigsaw Puzzles
September 2007 Riddle Solution Clique Partitioning
August 2007 Riddle Solution Three Points through every Line
July 2007 Riddle Solution Digit Anagrams
June 2007 Riddle Solution Mesh Animals
May 2007 Riddle Solution Chico and Dico
April 2007 Riddle Solution 3025
March 2007 Riddle Solution Primitive Polynomials

Enjoy!