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De Weerdt, Frauke; Desoete, Annemie; Roeyers, Herbert – Journal of Learning Disabilities, 2013
Elementary school children with reading disabilities (RD; "n" = 17), mathematical disabilities (MD; "n" = 22), or combined reading and mathematical disabilities (RD+MD; "n" = 28) were compared to average achieving (AA; "n" = 45) peers on working memory measures. On all working memory components, 2 (RD vs. no…
Descriptors: Elementary School Students, Short Term Memory, Reading Difficulties, Mathematics Skills
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Tournaki, Nelly; Bae, Young Seh; Kerekes, Judit – Learning Disabilities: A Contemporary Journal, 2008
This study examined the effects on math performance of the use of the rekenrek, a manipulative developed by Adrian Treffers. The rekenrek looks like an abacus, but differs in that it is based on a five-structure and not a ten-structure system. It is comprised of two rows of 10 beads, each broken into two sets of 5 by color (i.e., in each row the…
Descriptors: Mathematics Education, Learning Disabilities, Scores, Subtraction