3, Lesson 20, Unit 6, Grade 7, OpenUp icon
Instructional Activity

A’s and B’s

Lesson 20. Unit 6. Grade 7 Open Up Resources

Open Up Resources10 min(s)

This Instructional Activity is a part of the Lesson 20, Unit 6, Grade 7. In this activity students see an example of why applying properties is the only reliable way to decide whether two expressions are equivalent. They begin by substituting a value of the variable into expressions believed to be equivalent, and discover that the expressions are equal for that value. They then substitute other values and find that one of the expressions has a different value than the others.

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