Arithmetic Teacher (1993-1994) Vol. 41, No. 9

  • Arithmetic Teacher (1993-1994) Vol. 41, No. 9

    I ntroducing In vestigations: a refreshing new math program that can serve as a complete elementary curriculum, or as replacement units in key topic areas. Grades 3 and 4 are now available! I nvestigations is a researchbassed classroom-tested program designed to give students in-depth mathematical understanding-and to