Number Rack, by The Math Learning Center

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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 that use Windows 8 devices.

Feature:
Display 1 to 5 rows of beads, 10 beads per row. On the iPad, display up to 10 rows.