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
Up to three zooms into the number line.
The point can be dragged or assigned.
The start of the interval can be adjusted.
The point can be stepped by a relevant unit left or right, for predicting the 'next' number on the line at that scale.
Applet folder contains
+ original Cindy file if you use Cinderella
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.