This book brings together a collection of research-based papers on current issues in early childhood mathematics education that were presented in the Topic Study Group 1 (TSG 1) at the 13th International Congress on Mathematical Education (ICME-13), held at the University of Hamburg in 2016. It will help readers understand a range of key issues that early childhood mathematics educators encounter today.

Introduction.- 1. Research in early childhood mathematics education today.- 2. Promoting early mathematical structural development through an integrated assessment and pedagogical program.- 3. Repeating patterning competencies in 3- and 4-year old Kindergartners.- 4. ¿he influence of fostering children's pattern and structure abilities on their arithmetic skills in Grade 1.- 5. Ecuadorian Kindergartners¿ SFON development: Contribution of Early Numerical Abilities and Quality of Mathematics Education.- 6. Kindergartners' Spontaneous focus on number during picture book reading.- 7. Measurement makes numbers sensible.- 8. Figuring Space: Circling three children's geometric reasonings and sense.- 9. Observing the use of gestures in young children's geometry thinking.- 10. Math-In-Context: A study of the types of math preschoolers 'do' at home.- 11. Time, immersion and articulation: Digital technology for early childhood mathematics.- 12. What schemes do preschoolers develop when using multi-touch applications to foster number sense (and why)?.- 13. Interactive mathematics storybooks and their friends.- 14.- Early childhood teachers' knowledge and self-efficacy for evaluating solutions to repeating patterns tasks.- 15. Influences on early childhood educators' mathematics-related competencies, curricula and professional learning.- 16.- Early childhood mathematics education: Conclusions and moving forward.