This interactive Java learning tool, which was constructed using the cross-platform open educational resource GeoGebra, allows a teacher to demonstrate and explore addition and subtraction of integers from -10 to 10 with a number line model with students. Users can change the values of the first and second term using sliders. Another option models subtraction of the first term, for example, - (-4) + (-5). Check boxes allow users to show each expression, model, and answer individually.
Contributed by: Peter Tierney-Fife - Graphical designer, Education Development Center in Maine - Publisher
Math TopicAlgebraic Thinking, Number Sense, Basic Operations, Number Concepts, Mathematical Practices, Mathematical Processes
Grade Level5, 6+
Resource TypeActivity, Interactive Media
ContributorPeter Tierney-Fife - Graphical designer, Education Development Center in Maine - Publisher