Watched this video about Dor Abrahamson, http://youtu.be/qZaZGL-vP5E, and he had a non-computational tool for students to construct some understanding about fractions. Thought I'd make a more accessible GeoGebra version and this is it.[br][br]Drag either the red circle or the blue circle to change the length of the bars. The sketch will tell you when you match the fraction set by the sliders.[br][br]See also http://www.geogebratube.org/material/show/id/21709 for a different approach to fraction estimation.

Posted at http://mathhombre.blogspot.com/2011/09/fraction-sense.html