Increase student vocabulary with these prefix word wheels. Set 1 includes prefixes bi, tri, quad, hexa, penta, oct, mid, therm, and poly. Each of the 9 word wheels includes 9 words. These are especially helpful in a tutoring, small group setting, or for self-paced motivated students. Each prefix has two key word cards with definitions. Print on white or light colored card stock, cut the circles, punch a hole in the center with a paper clip or pin, and assemble with a round headed paper fastene