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Orrill, C. H., & Brown, R. E. (2012). Making sense of double number lines in professional development: Exploring teachers’ understandings of proportional relationships. ''Journal of Mathematics Teacher Education'', 15, 381–403.  
 
Orrill, C. H., & Brown, R. E. (2012). Making sense of double number lines in professional development: Exploring teachers’ understandings of proportional relationships. ''Journal of Mathematics Teacher Education'', 15, 381–403.  
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Son, J.-W. (2013). How preservice teachers interpret and respond to student errors: Ratio and proportion in similar rectangles. ''Educational Studies in Mathematics'', 84, 49–70.
    
[[Categoría:Matemáticas]]
 
[[Categoría:Matemáticas]]
 
[[Categoría:Herramientas]]
 
[[Categoría:Herramientas]]