Pentominoes:  If you take five squares of the same size and join them edge-to-edge, the resulting shape is called a pentomino.  There are 12 different pentominoes and the number of patterns you can make with them is very large.  This book shows some of the possibilities, poses some problems and suggests fruitful line of investigation.  8x8, Ages 12 & up  

#TQPT                   $9.99

Mensa Word Puzzles:  Pit your wits against the word wizards at Mensa Publications who have devised this demonic collection of over 200 mind-boggling word puzzles.  These are fun puzzles, but they are by no means easy.  If you can solve them, you’ll be a candidate for Mensa—the internationally famous high-IQ society!  Answers are included.

#RH22131              $13.99

Mensa Number Puzzles:  Pit your wits against the number crunchers at Mensa Publications who have devised this demonic collection of over 200 mind boggling number puzzles.  Answers are included.   

#RH2214X             $13.99

Mensa Puzzle Book Set:  Mensa Word  Puzzle Book & Mensa Number Puzzle Book show above. 

#RHMS                  $27.95

Who Tells The Truth?  A collection of logical puzzles to make you think!  All the characters in these puzzles make clear statements about themselves and others, but it is not clear whether or not they are telling the truth.  You must unravel the puzzle by thinking logically to decide which person to believe.  85 different puzzles to solve and some curious and paradoxical pictures to think about.  Hints & solutions included.  6 x 8, 49 pp, Ages 10 & up 

#TQ2774                $6.99

Mind’s Eye Geometry: Curious and interesting puzzles to amuse the visual imagination!  Each diagram poses an ingenious geometrical puzzle that has to be solved simply by looking, thinking, and imagining.  Self-checking answering system included.  8 x 8, Ages 12 & up  

#TQ2987                $9.99

Make Shapes - Mathematical Models: Each model is printed on crisp white paper ready to cut out and glue together.  At least 12 hours of enjoyment in each book  Lots of ideas for coloring & decorating. 

Make Shapes 1:  Ages 8 and up                                        #TQ2006                 $10.99

Make Shapes 2:  Ages 9 and up                                       #TQ2014                  $10.99

Cross Numbers: A collection of 32 mathematical puzzles!  The mathematical equivalent of crossword puzzles.  Anyone who enjoys arithmetic and likes to search for patterns and relations between numbers will love this book.  Multiple levels of difficulty - easy to tough!  Ages 10 & up                             

#TQ2952                $10.99