Economopoulos, Karen.

Putting together and taking apart : addition and subtraction / Addition and subtraction Karen Economopoulos, Susan Jo Russell. - Meno Park, CA : Dale Seymour Publications, 1998. - vi, 24, 202 p. : ill. ; 28 cm. - Investigation in number, data, and space .

"Developed at TERC [Technical Education Research Centers], Cambridge, Massachucetts." "Grade 2, also appropiate for grade 3."

ISBN: 1572326573

Subjects--Topical Terms:
Mathematics--Study and teaching (Elementary)
Mathematics--Study and teaching (Primary)
Arithmetic--Study and teaching (Elementary)
Arithmetic--Study and teaching (Primary)