I claim the ornamental design for a carpet square teaching aid, as shown and described.
FIG. 1 is a perspective view of the carpet square teaching aid showing my new design;
FIG. 2 is front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a side view thereof; and,
FIG. 6 is a front view of another embodiment of the carpet square teaching aid showing the removable insert partially removed.
The broken line showing the word “BARBARA” on the removable insert is included for the purpose of illustration only and forms no part of the claimed design.
The dashed line around the removable insert pocket represents stitching.