The authors provide a comprehensive and practical guide to early childhood mathematics, blending research, practice, and inspiration into a resource that teachers can immediately use. Through anecdotes, illustrative videos with a comprehensive index, and detailed assessment protocols, they show how learning trajectories and formative assessment can be used to inform instruction in powerful, meaningful ways. Written in clear and engaging language, the book explains the mathematics itself, how children think and learn, and how teachers can guide that learning with confidence and joy.Math...