Science Education Resource Center at Carleton College
Serc: Observing,comparing and Classifying Rocks
An activity where students in teams observe and classify different types of rocks.
Curated OER
Google for Education: Children and Technology: Sorting
Students learn about data sorting, and by what criteria can one sort things by different algorithms such as selection, insertion and bubble sort.
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.
Other
Math Stories: Finding a Pattern
At this one page site, you can work through step by step a sample problem that illustrates the problem-solving strategy for "identify a pattern." The answer is right there to help you check your thinking.