Abstract: Conceptual model-based problem solving (COMPS) was tested for its ef?cacy in teaching a student diagnosed with autism spectrum disorder to solve word problems involving multiplication and division. A sin-gle-case, multiple-baseline across behaviors design was conducted. The ability to solve each of three types of mul-tiplication problems examined (equal groups, multiplicative comparison and Cartesian product) was addressed separately. The student?s performance improved in all three, and it was maintained ?ve weeks after the intervention. The student also generalized the effects of instruction to two-step (addition and multiplica-tion) word problems. Knowledge transfer to an everyday situation was also assessed. The implications of these ?ndings for teaching multiplicative word problems to students diagnosed with autism spectrum disorder are discussed.

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