Resources and Tools for Elementary Math Specialists and Teachers
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      Challenging puzzle
      By Uncle Bob on 11/13/2012 - 14:06
    • Very challenging for the student that hasn't done magic sum type puzzles with smaller numbers. Even so, once the student is committed this will deliver lots of 2-digit sums practice and should encourage and develop mental math skill. Several puzzles available as well as notes for the parent/teacher, and background for the student.