The evolution of standards-based teaching
Exploring standard 1 : make sense of problems and persevere
Exploring standard 2 : reason abstractly and quantitatively
Exploring standard 3 : construct viable arguments
Exploring standard 4 : model with mathematics
Exploring standard 5 : use appropriate tools strategically
Exploring standard 6 : attend to precision
Exploring standard 7 : look for and make use of structure
Exploring standard 8 : look for and express regularity in repeated reasoning.