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dents ’ Knowledge of and Errors on Number Lines. http://citeseerx.ist.psu.edu/viewdoc/ download? doi=10.1.1.520.9334&rep=rep1&type=pdf Leinwand, S., Brahier, D., Huinker, D., Berry, R., Dillon, F., Larson, M., Leiva, M., Martin, W.G., Smith, M. (2014). Principles to Ac tions Ensuring Mathematical Success for All. National Council of Teachers of Math ematics. Siegler, R., Carpenter, T., Fennell, F., Geary, D., Lewis, J., Okamoto, Y., Thompson, L., & Wray, J. (2010). Developing effective frac tions instruction for kindergarten through 8th grade: A practice guide (NCEE #2010 4039). Washington, DC: National Center for Education Evaluation and Regional As sistance, Institute of Education Sciences, U.S. Department of Education. Retrieved from whatworks.ed.gov/publications/ practiceguides. Widjaja, W., & Stacey, K., Steinle, V. (2011). Locating negative decimals on the number line: Insights into the thinking of pre service primary teachers. The Journal of Mathematical Behavior, 30 (1), 80 - 91.

Derek Stiffler Mathematics Teacher, grades 6 - 8 Chancellor Middle School dstiffler@spotsylvania.k12.va.us

Jessica Hofer Math Specialist

Spotsylvania County Schools jhofer@spotsylvania.k12.va.us

Stephen Brazelle Math Specialist

Riverview & Livingston Elementary sbrazelle@spotsylvania.k12.va.us

Math Jokes

Why can ’ t a nose be 12 inches long? Because it ’ d be a foot!

What do you call a number that can ’ t sit still? A roamin ’ numeral!

Why did Pi get its driver ’ s license taken away? Because it didn ’ t know when to stop!

Do you know why seven eight nine? Because you ’ re supposed to eat three squared meals a day!

Virginia Mathematics Teacher vol. 47, no. 2

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