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Number Rack, by The Math Learning Center

By Clarity Innovations

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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 iPod Touches, iPhones, or iPads.


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

• Hide beads with the resizable shade, which allows teachers or learners to model subtraction or difference problems.

iPad only:

• Reverse the colors of rows 6 to 10 to distinguish (or not) groupings of 25 beads.

• Use the drawing tools to annotate work and show understanding

• Write equations and expressions with the text tool.


For more Number Rack resources, a web version of Number Rack, and other apps,


To learn about Bridges in Mathematics, an elementary curriculum that employs visual models such as the number rack, please visit:


This app is brought to you by The Math Learning Center, a nonprofit organization dedicated to K-12 math education since 1976. Visit us at:


The Number Rack app was made possible by a generous donation from Dr. David Moursund.

This app was crafted by Clarity Innovations. We help improve teaching and learning by creating solutions that match promising technologies with the needs of education. Visit us at:

What's New in Version 2.1

A fix to bead behavior on iOS9.


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Number Rack, by The Math Learning Center
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This app is designed for both iPhone and iPad
  • Free
  • Category: Education
  • Updated:
  • Version: 2.1
  • Size: 8.9 MB
  • Language: English
  • Developer:

Compatibility: Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.

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