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Want to find out more about students understanding of the equal sign? Here are 3 sources. 1. “The Importance of Equal Sign Understanding in the Middle Grades” Mathematics Teaching in the Middle School Eric J. Knuth, Martha W. Alibali, Shanta Hattikudur, Nicole M. McNeil and Ana C. Stephens May 2008, Volume 13, Issue 9, Page 514 (This article is being sent to you) 2. “Children's Understanding of Equality: A Foundation for Algebra” Teaching Children Mathematics Karen P. Falkner, Linda Levi and Thomas P. Carpenter December 1999, Volume 6, Issue 4, Page 232 3. Thinking Mathematically, Integrating Arithmetic & Algebra in Elementary School Thomas P. Carpenter & Megan Loef Franke Publisher: Heinemann Paperback ISBN: 0325005656