My present invention relates to didactic apparatus as particularly adapted to the tutelage of mathematical fundamentals, multiple choice statements, and the like. A set of inexpensive instructional problem or "flash" cards is prepared for the student for use in conjunction with, and as an essential part of my invention. Each interrogative card in the set contains a problem statement in student readable form, together with a machine readable cryptogrammic answer for the problem. As each problem card is methodically inserted into my didactic machine, the machine elements interpret the answer cryptogram, while the instructional problem remains visable to the student. The student summarily provides a response by inserting his separately selected answer elements from another set of answer cards which, in a way similar to the problem cards, have the plainly visible response elements clearly inscribed on each card, together with a machine readable code or cryptogram for each response element. As the answer cards are individually inserted into the machine operator, the answer card cryptograms are electronically compared with the problem card cryptogram and should they match, it means the student has entered the correct answer resulting in a student "correct answer" signal. Conversely, a non- coincident match may produce a "wrong answer" signal. Further embodiments of my invention include trial advance, scorekeeping, "answer too big" or "answer too small" visual indications, and sonant indications.
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