The number combinations, their relative difficulty and the frequency of their appearance in text-books
By: by Frank L. Clapp. Assisted by Bernard P. Huebner, with the advice of V. A. C. Henmon.
Contributors: Huebner, Bernard P.
Series: University of Wisconsin. Bureau of Educational Research. Bulletin; no. 2. July 1924
Published: 1924
Place of publication: Madison, Wis
Language: eng
Number of pages: 120
Subjects: Arithmetic -- Study and teaching; Educational psychology
Notes: Bibliography: p. 118-120.