CRA is a sequential instructional approach during which students move from working with concrete materials to creating representational drawings to using abstract symbols. Using this concrete-representational-abstract sequence helps students develop the thorough mental representations that are foundational for conceptual understanding.

Watch how CRA can be used to teach difficult math concepts. By using algebra tiles, students can connect concrete objects to abstract algebraic expressions.

*Videos are chosen as examples of strategies in action. These choices are not endorsements of the products or evidence of use of research to develop the feature.*

Learn how ST Math uses CRA to build mathematical understanding. All math concepts are first presented visually in games requiring digital manipulation of objects. As students progress, the math symbols are slowly introduced until a student sees the full equation represented in the game they are playing.

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