Mental math in the primary grades
by Jack A. Hope, Jack Hope, Larry Leutizinger, Barbara J. Reys, Robert Reys

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MathematicsProblems, exercisesMental arithmeticJuvenile literatureStudy and teaching (Elementary)Teaching Methods & Materials - MathematicsJuvenile NonfictionElementaryChildren: KindergartenEducation / TeachingTeaching Methods & Materials - WorkbooksConcepts - General