Adult places cover slip onto slide and places the slide onto the microscope. One student looks and counts. If 10 or more different, then teacher finds average. If closer, find number between the two. Return to seat.
Teacher graphs the number each pair recorded.
Students bring sample from pond, stream, or ditch near their home. Adults help with slide preparation. One drop on slide, put on cover slip, place on microscope. View the sample. Discuss with partner.