This series of podcasts is devoted to the topic of understanding young children's thinking in mathematics. Three major components frame each of these podcasts: 1) how children think about and solve math problems, 2) the kinds of tasks that elicit children's thinking and, 3) how teachers can build a deep understanding of the mathematics they teach. Some of the podcasts in this series feature examples of children's work and a short assignment for listeners to do after they have listened to the podcast. Other podcasts feature interviews with experts in children's thinking about mathematics.