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The use of manipulatives helps students create various geometric shapes and measure their area.
Math on Call, A Mathematics Handbook, by Great Source Education Group; ISBN 0-669- 45770-1
This two-day activity involves the composition and decomposition of trapezoids and irregular polygons. A trapezoid is a quadrilateral with exactly one pair of parallel sides. An irregular polygon is a closed figure whose sides are not all the same length.
Before teaching this lesson, students need to know how to find the area of squares (b x h), rectangles (b x h), parallelograms (b x h), and triangles (1⁄2 b x h). They should also be familiar with using rulers to measure in centimeters.
2. Become effective problem solvers by selecting appropriate methods, employing a variety of strategies, and exploring alternative approaches to solve problems.
4. Communicate mathematical ideas and arguments coherently to peers, teachers, and others using the precise language and notation of mathematics.1
Invitation to Learn
Play I Have, Who Has? with your class. You may need to remind them how to find the area of squares, rectangles, parallelograms and triangles.
Curriculum Extensions/Adaptations/ Integration
Ball, D. (1991). Whats all this talk about discourse? Professional Standards for Teaching Mathematics. National Council of Teachers of Mathematics, 1991.
Deborah Ball defines discourse as described by the NCTM Standards. A discussion from her classroom, along with entries from her teaching journal, illustrate how thoughtful discourse can be used to help students learn to discuss and understand mathematic concepts.
Bryant, V.A. (1992). Improving Mathematics Achievement of At-Risk and Targeted Students in Grades 4-6 Through the Use of Manipulatives. ERIC Source (ERIC #ED355107). Retrieved December 10, 2007, from http://eric.ed.gov./
This document presents a study designed to improve mathematics achievement in grades 4-6 through the use of manipulatives. The primary goal was to provide mathematics manipulatives that would assist in helping at-risk and targeted students. Results indicated improvement on test scores, report card grades, and use of mathematics manipulatives.