We use Montessori math and my daughter has advanced to elementary level math and I am using a mix of the free albums here http://mondorfment.blogspot.com/2010/02/6-9-elementary-montessori-albums.html and here http://www.moteaco.com/albums.html, but honestly it is so much work that I am just switching to Rightstart C. With a two year old in tow, I need it all laid out for me with a script. :-P
Julie
http://theadventuresofbear.blogspot.com
ds 4: AAS2, readers from library using SL lists, Montessori math (and Miquon and SM), eclectic science and history
ds 2 FIAR and B4FIAR