ABCya
Ab Cya: Same and Different
The Same and Different Donut Game is a pre-school activity to practice identifying objects that are the alike and not alike. Kids compare donuts based on shape, color and combinations of shape and color. After all rounds have been...
University of Cambridge
University of Cambridge: Nrich: Wag Worms
Use this challenge to see how many unique shapes can be created using exactly 5 cubes. At this one page website you can also check your results.
The Franklin Institute
The Franklin Institute: Classified
At this site from The Franklin Institute you can practice classifying objects according to physical structure and characteristics.
Science Education Resource Center at Carleton College
Serc: Going on a Leaf Hunt!
Students go outside take a closer look at leaves on a tree. The students collect leaves of different shapes or colors, and then sort into categories, and compare and contrast them to leaves that are non-native to Minnesota.