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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