Test Tube Division

Hi All,
 We've been busy working with a material in training that I have been
curious about how to use for some time...it is known as Test Tube
Division or Racks and Tubes. Here are some links to how to do the
lessons:

http://www.infomontessori.com/mathematics/passage-to-abstraction-racks-and-tubes.htm
http://www.youtube.com/watch?v=n3QQfIZFKjA
http://www.tjleone.com/long_division_montessori_version.htm
http://www.alisonsmontessori.com/Long_Division_Material_p/m76.htm
http://www.montessoriresources.com/Long-Division-MaterialBoardsBeadsTest-Tubes-P890C13.aspx (Gonzagareddi is much more expensive, but you can
take a look here at the materials and Albanesi support materials)
Here is their blurb:
This material is used for both short and long division, with dividends up to the millions and divisors of 1 to 4 digits. The complete set of material consists of a) seven wooden racks (3 white for simple units, 3 grey for thousands, 1 black for millions) each containing ten glass tubes, each of which holds exactly ten beads; b) 700 hundred beads in green, blue or red, for the glass tubes; c) seven cups in white, grey or black on the outside and with the appropriate hierarchical color on the inside; d) four wooden division boards, hierarchically color-coded; e) four sets of wooden skittles in hierarchical colors, 36 in all, in a wooden box; f) a wooden tray for holding the material and a wooden box for storing the material. The printed notes of this Montessori presentation from our CME Teacher Preparation Course are available for purchase from this webpage. Please search for: Long Division Game