NumBlox is a cusinaire rods app. Cusinaire rods (number blocks) are used to teach early math. NumBlox features a simple, clean interface, drag and drop blocks, rotate blocks, and a play area that grows to fit your web browser area. New version! NumBlox 2.0 features pencil, eraser, choice of grid style, stacking blocks, and scrollable edit area. NumBlox 2.1 adds 3 choices of block color scheme. Now for mobile! NumBlox is now available for iOS and Android, too! Mobile versions feature native sharing to Facebook, Twitter, and Email. Sharing can be disabled for young children. Now also available for NOOK HDTM and NOOK HD+TM by Barnes & Noble.