Children were pretested and assigned to one of three treatments: training with three dimensional manipulanda; the same program except that the instructional materials were line drawings; and a control. On the posttest, both experimental groups were significantly superior to control group. (Author)

The importance of having children manipulate small objects that can be grouped, arranged, and counted is discussed. Learning activities for one-to-one correspondence, numerals, and the four operations are given. (MNS)

Using squared paper as a concrete aid, children can explore important concepts about the perimeter and area of geometric figures. Activities are described and illustrated to develop several methods of finding perimeter and area. (MNS)

A strategy to make the transition from manipulative materials to a written algorithm for division is outlined in dialogue form. (MNS)

Ways to use popsicle sticks as concrete models of multiplication and division of fractions are given. (MK)

A geometric model used to teach properties of rational numbers to college students is described. (MK)

An activity for generating approximations of pi is described. (MK)

Solid polyominoes are formed by gluing cubes together so that the two faces of adjacent cubes are wholly in contact. Tessellations of a three-dimensional space with solid pentominoes are discussed and illustrated. (MP)

An account is given of the use of the calculator and Cuisenaire rods in examining decimals that result from the division of whole numbers. (MP)

Worksheets contain instructions and patterns for use in constructing models of the platonic solids from cardboard and rubber bands. (SD)

Supports teachers in resolving problems of teaching long division. Discusses an approach focusing first on modeling the partition process with base-10 blocks and having students come to a conceptual understanding of the standard long division algorithm. Evaluation of the approach concluded that it helped students conquer the division concept. (ASK)

Presents a hands-on activity for children to build and take home a basic model of the human skeletal system. Describes how to make "noodle people" from ordinary materials including pasta, pipe cleaners, straws, and margarine tub lids. (NB)

Provides ways of using geostrips to make different kinds of quadrilaterals. Employs combinations of four different length geostrips and works on classifying all of the quadrilaterals using different combinations of the strips. Discusses impressions for the classroom and presents some examples of class activities using geostrips and dynamic…

Sixth- and seventh-grade students (n=68) with learning disabilities in mathematics received either concrete-to-representational-to-abstract (CRA) or traditional instruction in algebraic transformation equations. Students receiving the CRA instruction outperformed peers receiving traditional instruction on both post-instruction and follow-up tests…