Behr, Merlyn books & textbook
Number Concepts and Operations in the Middle Grades
Natl Council of Teachers of / Paperback
isbn-10: 0873532651 / isbn-13: 9780873532655
Number Concepts and Operations in the Middle Grades: the Research Agenda for Mathematics Education, Volume 2 (Research Agenda for Mathematics Education Series)
Lawrence Erlbaum Associates /1988-07-01 Hardcover / 288 Pages
isbn-10: 080580353X / isbn-13: 9780805803532
Fundamentals of elementary mathematics;: Number systems and algebra
Academic Press /1971T Hardcover / 419 Pages
isbn-10: 0120847507 / isbn-13: 9780120847501
