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Peer reviewedMitchell, Charles E. – School Science and Mathematics, 1983
It is noted that defining subtraction independently of addition through use of physical objects can help one to illustrate the non-commutativity of this operation. Lack of awareness of the importance of the order of the digits may be a primary cause of errors in compound subtraction. (MP)
Descriptors: Basic Skills, Computation, Elementary Education, Elementary School Mathematics
Scandura, Joseph M.; Scandura, Alice B. – Focus on Learning Problems in Mathematics, 1987
Research on structural learning theory is reviewed as a base for designing computer-assisted instruction programs. An intelligent "Rule Tutor" emphasizing diagnosis and remediation for whole number concepts is described. (MNS)
Descriptors: Computer Assisted Instruction, Computer Software, Diagnostic Teaching, Educational Research
