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Desoete, Annemie; Stock, Pieter – Learning Disabilities: A Contemporary Journal, 2013
Counting abilities have been described as determinative precursors for a good development of later mathematical abilities. However, an important part of variance in mathematical achievement has also been associated with differences between instruction methods given in schools. In this study counting and instruction as predictors for mathematical…
Descriptors: Learning Disabilities, Mathematics Instruction, Computation, Mathematics Achievement
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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