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In this sorting activity, learners play a game in which they try to identify the largest number of differences between two objects.

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

In this activity (on page 2 of the PDF under GPS: Cactus Activity), learners will develop their own version of a tool used by biologists, a dichotomous key, by collecting all their left shoes.

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 play a guessing game to explore classification.

Learners explore their surroundings while reasoning about categories and counting.

In this classification activity, learners will learn one way of organizing plants and animals.

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