An experimental study to determine the relative difficulty of the elementary number combinations in addition and multiplication ...
By: By Harry Vance Holloway ...
Publisher: State gazette publishing co., printers
Published: 1915
Place of publication: Trenton, N.J
Language: eng
Number of pages: 102
Subjects: Arithmetic -- Study and teaching.; Educational psychology.
Notes: "Bibliography and references": p. 100-102.
Thesis (Ph. D.)--University of Pennsylvania, 1914.