Formative Assessment 82

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