A cardboard keyboard is a visual representation of an actual keyboard that can actually be very useful. You can learn note placement and fingering by practicing on a cardboard keyboard. This is especially helpful if you only have limited access to a real keyboard or piano. Some music teachers use cardboard keyboards when teaching a class of students to play the keyboard. The cardboard version allows students to practice but prohibits the noise of using multiple keyboard instruments all at once.
Look for patterns of black keys across the keyboard. The black keys occur in sets of two or three. These black keys are usually referred to as "sharps" or "flats."
Locate specific white keys. The note A is the first letter in the musical alphabet. It is located directly to the left of a third black key in a set of three black keys. The white keys that follow after A are B, C, D, E, F and G. The keys then start over again with A.
Locate middle C. C lies directly to the left of the first black key in a set of two black keys. On a full-size keyboard, middle C is near the middle of the instrument.
Transfer the notes of the staff on a sheet of music to the cardboard keyboard and practice "playing" these notes by pressing your fingers on the corresponding "keys." The lines of the treble clef (the upper set of staff lines) are E, G, B, D and F moving from bottom to top. The spaces are F, A, C and E. The lines of the bass clef (the bottom set of staff lines) are G, B, D, F and A, and the spaces are A, C, E and G.