Arithmetic, a programmed approach /
Pettofrezzo, Anthony J.
Arithmetic, a programmed approach / [textbook] by Anthony J. Pettofrezzo and Lee H. Armstrong. - Dalas : Scott, Foresman, 1982. - 854 pages : illustrations ; 28 cm.
Includes bibliographic references and index.
0673153142
Arithmetic.
Arithmetic--Programmed instruction.
QA107 / PET
Arithmetic, a programmed approach / [textbook] by Anthony J. Pettofrezzo and Lee H. Armstrong. - Dalas : Scott, Foresman, 1982. - 854 pages : illustrations ; 28 cm.
Includes bibliographic references and index.
0673153142
Arithmetic.
Arithmetic--Programmed instruction.
QA107 / PET