Ways to think about mathematics : activities and investigations for grade 6-12 teachers / Steve Benson with Susan Addington ... [et al.]. Benson, Steven. Mathematics Study and teaching (Elementary) Activity programs. Mathematics Study and teaching (Secondary) Activity programs. QA135.6 .W39 2005 510.71 22 WAY Thousand Oaks, Calif. : Corwin Press, c2005. c2005. 2005 Text xviii, 242 p. : http://www.loc.gov/catdir/toc/ecip0417/2004007970.html http://www.loc.gov/catdir/enhancements/fy0658/2004007970-d.html http://www.loc.gov/catdir/enhancements/fy0734/2004007970-b.html eng