4. The apparatus of claim 1 wherein said computation selector and said answer verifier are united together as a single piece of equipment, with said problem board member and said answer board member oriented back-to-back on opposite sides of said piece of equipment.
4. The apparatus of claim 1 wherein said computation selector and said answer verifier are united together as a single piece of equipment, with said problem board member and said answer board member oriented back-to-back on opposite sides of said piece of equipment. 5. The apparatus of claim 4 where in said indicia carried on said problem board member and said indicia carried on said answer board member are on opposite sides of a single base member, whereby the board portion of said problem board member and said answer board member is one and the same.