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Cumming, J. Joy; And Others – Focus on Learning Problems in Mathematics, 1994
Tests of (n=107) third through sixth graders' basic addition facts found that 34% of errors involved the addition of zero and 83% of the remaining errors involved at least one of the digits 7, 8, or 9 when the other addend was 4 or more. (20 references) (MKR)
Descriptors: Addition, Arithmetic, Computation, Elementary Education
