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### A Geometric Investigation of (*a* + *b*)^{2}

9-12

This interactive demonstrates why (*a*+

*b*)

^{2}

^{}= a

^{2}+2ab + b

^{2}.

### Algebraic Transformations

6-8, 9-12

This applet allows you to explore commutativity and associativity within a geometric situation.### Bar Grapher

3-5, 6-8

Graph data sets in bar graphs. The color, thickness and scale of the
graph are adjustable. You can input your own data, or you can use or
alter pre-made data sets.### Circle Grapher

3-5, 6-8

Use this tool to graph data sets in a circle graph. You can input your own data or alter a pre-made data set.### Cubes

3-5

Use this applet to determine the volume of a box by filling it with cubes, rows of cubes, or layers of cubes. Determine the surface area as well by using the box's net.### Data Grapher

3-5, 6-8

The Basic Data Grapher can be used to analyze data with bar graphs, line
graphs, pie charts, and pictographs. You can enter multiple rows and
columns of data, select which set(s) to display in a graph, and choose
the type of representation.### Electronic Abacus

Pre-K-2, 3-5

This applet explores the use of an abacus model for representing numbers and for performing addition.### Factor Game

3-5, 6-8

Exercise your factoring ability against a human or the computer in this Calculation Nation game.### Fire

3-5, 6-8, 9-12

This applet is designed to simulate the spread of a wildfire using probability.### Fraction and Percent Tool

3-5, 6-8, 9-12

This tool allows you to explore fractions, decimals and percents by creating fractions with denominators up to 100.