Abstract: An instruction set for solving a specific mathematical problem includes a column of sheet material for manual entry of data in appropriate horizontal spaces as designated by the instruction set. The spaces include color indicia corresponding to color indicia appearing on function keys of an electronic calculator. A carrier is provided to receive the sheet material column with the carrier being slidably received within the calculator. The calculator includes an aperture which successively exposes each horizontal space when the carrier is moved relative to the calculator housing. To solve the problem, the user enters the numerals appearing in the space exposed by the aperture by depressing appropriate calculator numeral keys and then depresses the calculator function key corresponding to the color appearing within the aperture. In some instances, the numerical data appearing in selected spaces may be preprinted. In an alternate embodiment, a bracket removably attaches to the calculator housing.