Part of the Big Ideas

Shapes can be combined and separated (composed and decomposed) to make new shapes.

Opportunities to combine, rotate, and compare shapes will help children develop understanding of part-whole relationships within and among shapes (as when two identical right triangles are combined to make a rectangle).

© Erikson Institute’s Early Math Collaborative. Reprinted from Big Ideas of Early Mathematics: What Teachers of Young Children Need to Know (2014), Pearson Education.

Foundational Math Concepts

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