Number Rack facilitates the natural development of children’s number sense. The movable, colored beads encourage learners to think in groups of fives and tens, helping them to explore and discover a variety of addition and subtraction strategies. This virtual version of the manipulative is an open-ended educational tool, ideal for elementary classrooms and other learning environments. The number rack is a key component of Bridges in Mathematics, second edition. Online preview available. Visit The Math Learning Center for more information about using the Number Rack, including a free activity guide: www.mathlearningcenter.org/apps. App Features • Display 1 to 10 rows of beads, 10 beads per row. • Hide beads with resizable shades, which allows teachers or learners to model subtraction or difference problems. • Reverse the colors of rows 6 to 10 to distinguish (or not) groupings of 25 beads. • Enter text directly from your keyboard with the writing tool. Add labels, descriptions, or instructional text to your work. • Edit equations and other math text using a traditional text field. • Add drawings on the workspace to explain thinking. • Share your work by saving an image or url, or providing a sharing code to others. Great for creating the initial setup of an activity, then sharing it with students so they can explore it further.
