Return to Mathematics IndexPrimary Geometry

Pitra, Barbara Marconi Community Academy

854-2810

Objectives:The children will name, identify and categorize the geometric shapes (triangle, square and rectangle) by the number and length of the sides. The students will identify triangles, squares and rectangles in their environment. Through observation, comparison and manipulation the children will construct pictures, shapes and patterns with the triangle and square. Using game formats the students will gain practice in recognizing and naming geometric shapes.Apparatus needed:1. various sized plexiglas triangles, squares and rectangles with magnetic tape applied to the backs of the shapes so they will stick to the blackboard 2. 20 triangles and squares made of plexiglas or paper (2" on a side) 3. a ditto of triangles and squares for each child (2" on a side) 4. glue 5. scissors 6. overhead projector 7. "Color and Shape Bingo" by Trend Co. 8. 1 deck "I have ....who has...." cardsRecommended strategy:This presentation is appropriate for use with primary children. Using the plexiglas shapes the students will discuss similarities and differences as well as various ways in which the objects could be categorized. Elicit from the children that a triangle has 3 sides, a square has 4 equal sides and a rectangle has 2 long sides and 2 short sides. On the blackboard make a category heading for each shape and have several students go to the board and place the magnetic shapes under the correct heading. Review names and characteristics of each shape. Why did you place that object there? What are the characteristics of that shape? What is your shape called? Ask the children to name these geometric shapes as they identify them in the classroom and their environment. The children will cut out squares and triangles from ditto sheets in several different colors. All of the new shapes and patterns that will be constructed will be shown on the overhead projector. This will help the child who has difficulty seeing patterns or because of poor eye-hand coordination. Shapes must not overlap or cover other shapes. They must line up evenly. Ask the students to show that: squares can make bigger squares, squares can make rectangles, triangles can make bigger triangles, triangles can make hexagons but our triangles cannot make squares or rectangles (we didn't have right angles). Allow the students to experiment with color and shape in making new figures, shapes and patterns. Demonstrate some of the creations on the overhead. After the class has had adequate time to experiment, request that they glue their "favorite" on to a piece of manila paper. Play Trend Co.'s "Color and Shape Bingo" or make a bingo game. The "I have ... who has ..." card game is teacher made. It consists of a deck of cards, one for each student. The cards may be used to drill many topics. For example, the child reads his card, "I have a red square, who has a blue rectangle." The child who has the blue rectangle then reads his card, etc. The last card read is the winner.