`Logic and ReasoningPearline Scott                 Greeley School                               832 W. Sheridan Road                               Chicago, Il 60613                               312-534-5800Objectives:   The student will use logic and reasoning strategies to classify blocks by their attributes. The student will be able to recognize one, two and three attribute differences. The student will use Venn diagrams to form sets and show their intersection. The student will use the attribute blocks to form ratios.Materials needed:Attribute blocks: The blocks used in this lesson may be commercial                  or teacher made, with these attributes:                   Color-red, yellow and blue                  Shape-square, circle, hexagon, rectangle and triangle                  Size-small and large                   Thickness- thick and thinloops, color chalk and worksheetsStrategy:1. The students will work in cooperative groups.  First let the students examinethe blocks, freely playing with them.  Direct the students to classify blocks bytheir attributes: color, shape, size and thickness. 2. Ask the group to place one block on the center of the table and find all blocks that differ by one, two and three attributes. 3. Use the loops to form sets in a Venn diagram.  Example: in one loop place a set of triangles and in another loop place a set of blue blocks.  Students will notice that these sets must overlap, forming the intersecting set of blue triangles. 4. Write ratios to show the comparison of two sets of attribute blocks.  Example:  write the number of red circles to the total number of circles, thus forming a ratio. Conclusion:The students will use logic and reasoning strategies to process information and solve problems. `