Ellsworth, Elmer E.2016-10-122016-10-1219391939b14679942(OCoLC)07823414(OCoLC)ocm07823414https://hdl.handle.net/2144/18270Thesis (M.A.)--Boston University, 1939. This item was digitized by the Internet Archive.en-USBased on investigation of the BU Libraries' staff, this work is free of known copyright restrictionsWhat arithmetic do children use in their out of school life?Thesis/Dissertation