Illustrating Addition and Subtraction of Proper Fractions

Suitable for self learning or classroom lesson presentation. Updated 11 Aug 2014. Minor bug in mixed number fraction display. Updated 17 Mar 2019 Use of button to step through addition & subtraction process, and use inputboxes for numerators and denominators See John Ulbright's work at https://www.geogebra.org/material/show/id/szwBQ7wa (which uses bar diagrams to represent fractions) See also https://www.geogebra.org/material/show/id/qwjhd8kx on comparing fractions by converting to equivalent fractions using common denominators or common numerators!
 
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