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http://teacher.scholastic.com/products/dothemath/about.htm
I had the opportunity to attend a Marilyn Burns workshop at the Scholastic Flagship Headquarters in Soho last May and another one this past April while I was attending the NCTM is Washington, D.C. I believe that "Do the Math" could be an excellent choice for intervention programs. Check it out if your school is looking for additional support in mathematics for those students for whom Number Sense and Operation still seems to be the insurmountable obstacle to success in mathematics.