Warning: All Applets are in Cinderella, dynamic geometry and physics simulation software, which can be obtained free from Cinderella.de.
.html files may be able to be opened in a java-enabled browser such as Safari or Firefox
See also Structured Variation Grids (SVGs)
Displaying Fractions arithmetic as operators on rectangles
The applet has two modes:
Choosing cells and displaying the corresponding fraction operator
Choosing fraction operators and seeing them instantiated as actions on a grid.
The arithmetic can be multiplication, addition or subtraction.
Notes on Applet use
Decimal Names of Points on a Number Line
Number Line Readings
Number Line Fractions: Addition & Subtraction
The brown and red segments can be dragged along their number lines; the numerators and denominators can be chosen by using the arrows or by dragging the end of the segment.
The idea is to provide a number line based image of how adding and subtracting of fractions works, by finding a common measure.
The applet has notes about its use.
The original Cinderella-Based applet is included with a webarchive file that should work on any browser.