sharpened pencil, unsharpened pencil, 1 dice, large paper clip,
small paper clip, white chalk, colored marble, white (I used clear) marble,
piece of wood (over 10 cm long), eraser
This was a great way to introduce classification. My kids said the dichotomous key was sort of like the Choose Your Own Adventure books we have gotten from DonorsChoose! I thought that was a great connection! This activity was also a great team builder, as they had to work together and figure out in their teams if an eraser is or is not a writing instrument. We had a lot of really good conversations about little difference in things.
This was also a great review about measurement and how to read centimeters on a ruler with both inches and centimeters. We also discussed why our rulers are marked as millimeters and how many millimeters it takes to make 1 centimeter.
You can find the work sheet, instructions, and more dichotomous key ideas on Science Spot!