To investigate the inßuence of an innovative math ßuency intervention, 36 middle-school students were randomly assigned to either an experimental (the Detect, Practice, Repair [DPR]) or control condition (reading intervention). After covarying pretest scores, the DPR treatment produced a signiÞcantly higher (p = .016) adjusted mean (M) math score (M = 47.53, standard deviation [SD] = 3.26) for the intervention group when compared to the control group (M = 33.31, SD = 4.39). The intervention is described so that teachers and consulting school psychologists can implement the steps for individuals or groups (e.g., in a multitiered response to intervention model). C 2009 Wiley Periodicals, Inc.Response to intervention (RTI) as a method of identifying learning disabilities is being scaled up across the United States, and there is a growing need for effective math interventions. Increasingly, researchers are evaluating the scientiÞc merit of various mathematics intervention models (e.g., see Maccini, Mulcahy, & Wilson, 2007, for a systematic review of cognitive, behavioral, and alternative math interventions). The National Council of Teachers in Mathematics (NCTM) emphasizes the importance of mathematics facility. In addition, the need for higher levels of math competence has increased in this technology-based world, and a lack of knowledge, understanding, and skill development can close doors for students. Based on principles set forth by the NCTM, instructional programs in math for all students should enable them to understand numbers, number systems, ways of representing numbers, relationships among numbers, computational ßuency, and the ability to make reasonable estimates. Although these skills are an important aspect of overall learning and long-term achievement, one of the Þrst steps in learning math as conceptualized by Haring and Eaton (1978) is accurate responding to basic mathematical facts, often referred to as basic math computation, which includes simple (basic) computations of single-digit addition, subtraction, multiplication, and division (e.g., 5 + 5 = , 5 − 5 = , 5 × 5 = , and 25/5 = ).Many teachers have traditionally focused on providing students with ample instruction and practice, allowing them to successfully produce correct, accurate responses when tested. After students demonstrate their ability to produce correct answers, teachers will typically move on to the next skill. Although striving for accuracy is desired by many teachers (Johnson & Layng, 1992), it may impair the development of ßuency in basic skills. For example, two students who have achieved 100% accuracy may not have the same ßuency level or expertise. If one student takes 5 minutes to complete a worksheet accurately and another takes 10 minutes to complete the same worksheet with the same accuracy, it is assumed that the Þrst student is more skilled in the particular mathematical area (Miller & Heward, 1992). Thus, accurate responding should not be the sole criterion to measure the mastery of an acquired skill. A measure of ßuenc...