Abstract: A calculator-type educational device for teaching arithmetic which provides features to motivate a student to greater learning progress including means for reporting the student's arithmetic proficiency by means of post-test statistics that are displayed after completion of a problem set. A dual mode of operation is provided, namely, a first mode in which a selected number of problems is presented for a student to solve at his own pace without any specified time limit and a second mode in which the student is presented problems in a specified period of time, the number of problems being determined solely by how rapidly the student can offer a proposed solution to each such problem.An additional unique feature of the present invention is the availability of numerical limits and factor multiples to which the problem parameters are related.The disclosed embodiment incorporates a microprocessor-based programmed computer in a desk-type calculator configuration.