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This interactive Java learning tool, which was constructed using the cross-platform open educational resource GeoGebra, allows a teacher to demonstrate and explore integer operations with students using two different balloons and sandbags models. Drag balloons, sandbags, and/or zero pairs onto the board and students see how the total result shown on the board changes the models. Nine pre-set integer addition and subtraction problems are given, as well as the ability to create your own problems (option 10). An alert is given when the first term of each expression is formed. (The models can also be used during discussions of multiplication and division, although no problems are included.)
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