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

Version 2.3.4

New features added to the math text tool:
• When fractions are created using the text tool, they are automatically converted to the stacked fraction format.
• More symbols for writing equations and expressions.

Ratings and Reviews

4.6 out of 5
7 Ratings

7 Ratings

Iowamom2013 ,

Wonderful tool

This app is perfect for use with my children! They like to do anything on the iPad, so this math tool helps keep them engaged during math lessons at our homeschool. It is easy to use, and general enough to be used with any curriculum. For those looking for an app that teaches math skills, this is not it. This is designed to be a teaching tool, not a game. I love that it is free, and no ads!

Unripe Apple ,


We own a physical abacus but this app is excellent for when we’re on the road or for late at night in the dark when we’re doing some bedtime math. And the added features are great, like being able to write on it. Love it! Thank you so much for offering this for free.

Math coach123 ,

Amazing app!!!

I have been waiting for an app for the rekenrek and this one does exactly what I was looking for!!!!! Genius!! What a great learning tool for students!! The free price makes this even better!!!!!


Clarity Innovations, Inc.
10.5 MB

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



Age Rating
Rated 4+
© 2017 The Math Learning Center


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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