Can below average sixth grade pupils be made proficient in addition and multiplication, and at what expenditure of time and effort?

Rockwood, Lois2012-11-202012-11-2019401940b1467531https://hdl.handle.net/2144/4498Thesis (Ed. M.)--Boston University, 1940en-USBased on investigation of the BU Libraries' staff, this work is free of known copyright restrictionsCan below average sixth grade pupils be made proficient in addition and multiplication, and at what expenditure of time and effort?Thesis/Dissertation