A study of the persistence of a crutch when multiplying by a two-place number

Cogswell, Norma2014-04-042014-04-0419551955b14651841https://hdl.handle.net/2144/7982Thesis (Ed.M.)--Boston Universityen-USBased on investigation of the BU Libraries' staff, this work is free of known copyright restrictionsA study of the persistence of a crutch when multiplying by a two-place numberThesis/Dissertation