Abstract: A computer-based assessment that presents basic math facts in an operation and records the amount of time taken to answer each fact correctly. By measuring the latency of the response, the program can accurately determine the facts that are being recalled from memory and those that are solved using a counting or other procedural strategy. Once an initial assessment is completed, a grid is constructed that allows the student and teacher to see the fluent facts as well as those facts that were answered slowly and/or incorrectly. The system uses the grid to begin instruction on the non-fluent facts. Math facts are systematically presented, thereby instructing the student until the facts are mastered.