American kindergarteners are falling behind in math. The solution? Challenge them more.

Kindergarten is supposed to be a year of transition—the time when toddlers become bona fide students. But when it comes to math, American kindergartens are falling way behind. Teachers are focusing on material that kids already know, challenging them little and costing them big in the long run. Assistant Professor Amy Claessens helps us understand why, and what can be done about it.

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