Assessment Problem:

Are these two equations equal to each other?

Why or Why not?

• 3x = 5 + 4

• 3 + x = 5 + 4

Common Responses:

Yes, because “3x and “3+x” both equal 9, therefore 3x = 3+x

No, not if “x” must be the same value for each. 3•3 = 5+4 but 3+6 = 5+4

Domain:

Variables & Expressions

Theme:

Recognizing equal equations

Common Core Standards:

6.EE Expressions and Equations