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…

Children with learning disorders (LD) are at increased risk for a host of psychosocial problems, including Attention Deficit Hyperactivity Disorder (ADHD) (e.g., Bouffard, Roy, & Vezeau, 2005; Elksnin & Elksnin, 2004; Greenham, 1999; Michaels & Lewandowski, 1990; Sideridis, Morgan, Botsas, Padeliadu & Fuchs, 2006; Weiner &…

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…

Two general models exist for implementing Response to Intervention (RtI) for struggling students, the standard protocol model and the problem-solving model. This study examined the long-term outcomes of one example of the problem-solving method, the Instructional Support Team (IST), in a field setting. Academic records of 32 students were reviewed…