http://www.ldonline.org/ld_indepth/technology/babbitt_math_tips.html -- "Tips to guide teachers and parents in selecting instructional math software. The focus here is on instructional software such as concept development, drill and practice, tutorial and simulation software rather than tool software such as spreadsheets or graphing software."
http://www.mathfactcafe.com -- Free printable math fact sheets for drill and practice are available at this site.
http://www.k111.k12.il.us/king/math.htm -- This is a website managed by King Middle School (grades 4-6) with a multitude of on-line math activities you can have your child do or print them out for later use. In my years of teaching special needs students, I have frequently found that a reluctant learner can be more motivated to work simply by providing the assignments on a computer screen. This is a helpful site for that purpose.