Very Good with no dust jacket. 0404557384. Library stamps/marks/labels/pocket, otherwise slight wear. Crisp copy.; Facsimile reprint of 1938 edition. "The specific problem of this study was to determine whether there is any difference in efficiency between the methods of subtraction in whole numbers as used in this country."; Columbia University Contributions to Education: Teachers College Series; Ex-Library; Vol. 738; 76 pages.
The Relative Merits of Three Methods of Subtraction: An Experimental Comparison of the Decomposition Method of Subtraction with the Equal Additions Method and the Austrian Method
by John Theodore Johnson
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