Formative Assessment

Assessment Problem: 

Given 5a = b + 5, which is larger: a or b?

Domain: 
Algebraic Relations
Theme: 
Solving inequalities
Common Core Standards: 
6.EE.5
Research References: 
Lim, K. H. (2006). Characterizing students' thinking: Algebraic inequalities and equations. Paper presented at the 28th annual meeting of the North American Chapter of the International Group for the Psychology of Mathematics Education, Mérida, México: Universidad Pedagógica Nacional.