Unit 6, Lesson 20
Combining Like Terms (Part 1)
Grade 7
Preparation
Lesson Narrative
In this lesson, students use properties of addition to justify that expressions are equivalent. As students explain how they know two expressions are equivalent for all values of the variables, they attend to precision (MP6). Students practice writing equivalent expressions with fewer terms. The given expressions do not include any parentheses.
The last activity is optional because it provides an opportunity for additional practice adding and subtracting signed numbers in the context of writing equivalent expressions.
- Apply properties of operations to justify (orally and in writing) that expressions are equivalent.
- Generate an expression with fewer terms that is equivalent to a given expression.
- Interpret different methods for determining whether expressions are equivalent, and evaluate (orally) their usefulness.
Let's see how we can tell that expressions are equivalent.
Required Preparation
None
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