Classroom demonstration calculator

Abstract

Abstract A teaching device, for use in a classroom, comprising a hand-held size calculator adapted to normally include a display for showing the numerical output of the calculator, and adapted to include a face plate having a plurality of keys which are arranged in a particular pattern and which bear indicia indicating the calculator function of the keys. The calculator does include a circuit for producing a signal in response to depression of the face plate keys of the hand-held size calculator. The teaching device further includes an enlarged keyboard including a plurality of enlarged keys arranged in a key pattern simulating the face plate keys of the hand-held size calculator, and indicia on the enlarged keys simulating the indicia on the faceplate keys of the hand-held size calculator. The indicia is readily readable anywhere within the classroom. The keyboard also includes a plurality of switches responsive to depression of the keyboard keys. The teaching device also includes wiring for operably connecting the keyboard switches to the signal producing circuit so that the keyboard switches operate the calculator in the same manner as the face plate keys of the hand-held size calculator. The teaching device also includes an enlarged display including numerical characters readily readable anywhere within the classroom, and an interface circuit for operably connecting the enlarged numerical display to the signal producing circuit so that the enlarged display shows the numerical output of the calculator.

Inventors

• 👤 Beverly Gimmestad
• 👤 Douglas Brumm

Bibliographic Details