http://illuminations.nctm.org/activity.aspx?id=3482

"Use tiles to represent variables and constants, learn how to represent and solve algebra problem. Solve equations, substitute in variable expressions, and expand and factor. Flip tiles, remove zero pairs, copy and arrange, and make your way toward a better understanding of algebra."

 

Resource created by the National Council of Teachers of Mathematics (NCTM) to adhere to CCSS and the 8 Mathematical Practices.

 

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