give students opportunities to access grade-level mathematics in age-appropriate contexts. The Extra Support Materials do not delay Algebra 1 content, and invite students to reason mathematically and communicate their thinking at the same level of rigor as the Algebra 1 course.
provide students opportunities to be and feel successful. A small number of high-leverage instructional routines focus on number sense, precision of language, and mathematical reasoning that all students can access. These routines are repeated so that students can see their “thinking like a mathematician” skills improve throughout the course.
focus on routines that build a positive classroom culture in which everyone is expected to share their thinking, all ideas are considered seriously, and there is collective responsibility for making sense of the ideas offered. This is not only good mathematical practice, it is also a way of showing students who have historically felt that they didn’t have good mathematical ideas that their thinking is valuable.

Illustrative Mathematics Algebra 1 Extra Support Materials