National Council of Teachers of Mathematics
The Math Forum: Understanding Algebraic Factoring
This site from the Drexel University explains the principles of factoring symbolically using algebra tiles.
Texas Instruments
Texas Instruments: Introduction to Some Algebra Concelpts Using Cas
This series of activities provides an introduction to some Algebra concelpts using CAS. The activities start with Algebra tiles and CAS. Patterning is modelled for the students so that they can construct the knowledge rather than be...