Get both of the following publications:

Problem Solving: Just For the Fun of It! (4-9)
21 activities – 144 pages

Problem Solving: Just for the Fun of it! Book Two (4-9)
21 activities – 189 pages

These books provide a way to nuture a positive attitude towards math whle you improve your students' problem-solving skills. Topics include math patterns, paradoxes, palindromes, and mathematical micro-worlds.