Lesson 9

Working with Signed Numbers

These materials, when encountered before Algebra 1, Unit 6, Lesson 9 support success in that lesson.

Lesson Narrative

In Algebra 1, students build on the skills from grade 7 involving applying the distributive property when signed numbers are involved and combining like terms. The purpose of this lesson is to revisit, refresh, and practice that grade 7 work in preparation. For example, in Algebra 1, students are expected to expand expressions like \((x+4)(x-5)\). In grade 7, they encountered expressions like \(\text-2x(x-5)\).

Learning Goals

Teacher Facing

  • Practice expanding and factoring using the distributive property (with diagrams for support) with terms that have negative coefficients.
  • Recall multiplication of positive and negative numbers.
  • Rewrite subtraction expressions as adding the opposite.

Student Facing

  • Let’s work with signed numbers.

CCSS Standards


Building Towards

Print Formatted Materials

Teachers with a valid work email address can click here to register or sign in for free access to Cool Down, Teacher Guide, and PowerPoint materials.

Student Task Statements pdf docx
Cool Down Log In
Teacher Guide Log In
Teacher Presentation Materials pdf docx

Additional Resources

Google Slides Log In
PowerPoint Slides Log In