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In this activity, learners separate materials based on their special properties to mimic the way recyclables are sorted at recycling centers.

In this card game, learners make two sets of three cards that are alike. Learners must justify to the rest of the players why the three cards belong in each set.

In this activity, learners explore a bucket of sand and beach objects.

In this activity, learners play a guessing game to explore classification.

In this online game, learners test their skills of categorization.

Learners practice their taxonomy skills by sorting a group of fasteners (e.g. rubber bands, buttons, paper clips, screws) into different categories.

In this math activity, learners sort patterns into similar "families" or groups that have the same pattern, but different symbols.

In this environmental activity (page 6 of the PDF), learners identify household products that are recyclable and explore the different types of recyclable plastics.

This Exploratorium activity explores size and scale. Through four levels of screen sizes, learners can sort out objects of different sizes.