The purpose of this study was to find out what difficulties Nicaraguan children encounter in doing addition and subtraction exercises. The results were used in the design of radio lessons in mathematics for elementary school. The performance on addition exercises is analyzed with a view toward identifying the distinct skills that are required by…

Examines 109 children from grades 3 through 6 for computational facility and the relationship between automaticity, or efficient processing of addition facts, and success in more complex tasks. Indicates that most errors on the multidigit sums were due to fact inaccuracy, not algorithmic errors. Discusses instructional implications for students…

This study involved the extensive testing and interviewing of 102 primary grade pupils, representing a sampling from diverse school environments, to study the capabilities and difficulties evidenced by primary-grade pupils in solving open addition and subtraction sentences. Phase 1 of the study identified the specific incorrect procedures commonly…

Assumptions frequently made about learning disabled children are discussed, with many teaching suggestions provided. (MN)

This set of papers was selected from presentations made at the Fourth and Fifth Annual Conferences of the Research Council for Diagnostic and Prescriptive Mathematics because of their pertinence to classroom teachers. The papers concern: (1) "Research and Development Related to Learning about Numerals for Whole Numbers: Implications for…