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XtraMath is a Seattle-based nonprofit organization dedicated to math achievement for all. Our goal is to develop effective, efficient, adaptive and intrinsically rewarding supplemental math activities and make them available for free. Great for tracking individualized fact fluency.

"Once students have developed conceptual understanding of the basic operations they need to develop fluency with the facts. One quick way to include daily practice and motivate students to master these basic facts is through the use of the Who Has? card decks."