The Number Line: Unifying the Evolving Definition of Number in K–12 Mathematics

摘要

Introduction Beginning in the spring of 2016, a team of more than thirty mathematics teachers, mathematics educators, and mathematicians at Illustrative Mathematics began to write a grades 6–8 mathematics curriculum that was released as an open education resource in the summer of 2017. Since then the team has expanded, and Illustrative Mathematics released a high school curriculum in the summer of 2019 and will release a grades K–5 mathematics curriculum in the summer of 2021. The four authors of this article are mathematicians who have worked together since the inception of Illustrative Mathematics in 2011 on these and other K–12 mathematics projects.