Number, Measurement and Space, module establishes equivalence of sets by a one-to-one exchange of objects. Eg Upsetting equivalance (destroying conservation of numbers) by adding one object to a set, or taking one away, helps introduce vocabulary for comparing quantity
Online Learning System, 1-Year Class License Provides access for 1 teacher and up to 150 students to ready-to-use lessons; easy-to-use authoring templates to develop custom, digital lessons; unique learning management system to track and analyze student performance
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