Assessment Problem:

p and q are odd integers between 20 and 50.

For these values, is 5p–q>2p+15 always true, sometimes true or never true?

Domain:

Algebraic Relations

Theme:

Thinking about Inequalities

Common Core Standards:

6.EE.5

6.EE.8

Encyclopedia Entry:

http://www.algebraicthinking.org/wiki/algebraic-relations-inequalities

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.