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 \((x+4)(x5)\). In grade 7, they encountered expressions like \(\text2x(x5)\).
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
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