Abstract: An electronic teaching device for teaching addition and subtraction to students in the primary grades. The device is of simple construction utilizing digital electronic components. The invention utilizes an enclosure or box which invites students to use the device as a toy or game while facilitating learning of simple mathematical tables. In the preferred embodiment the student gains access to the box, and a reward, which may be placed inside it, if he correctly completes a simple algebraic equation which had previously been setup by a teacher.