My view on the role of geometry in grades K-8 is that it is important , essential and is equivalent to arithmetic in importance. Currently, when I substitute in kindergarten and first grade classes, I am
pleased to see that most of the schools ( where I am assigned) use Everyday Calendar Math. Therefore, the students are identifying patterns and shapes on a daily basis. It is built into the curriculum. This eliminates the problem of children receiving a "traditional" geometry unit at the end of the year. As was mentioned, during the panel discussion in Workshop # 4 this has often happened in the elementary grades. With Everyday Calendar Math , the children spend time identifying patterns (colors or shapes). Also, they discuss the different geometric shapes and the properties of those shapes on a daily basis. Therefore, even if the kindergarten students are not taught a geometry unit during the year, they receive exposure to patterns and shapes for at least 20 minutes every morning. Of course, Calendar Math does not replace a unit on geometry for Kindergarten and first grade but it is better than no exposure at all.
A foundation for geometry should be provided in kindergarten and 1st grade and should be taught at all levels in the primary grades. With the technology boom, space exploration/ discoveries and nuclear energy/war etc., the manner in which we describe our world and universe has changed. Mathematics is another form of communication and it has changed dramatically also. Students must be prepared in elementary school to learn the language of mathematics. Also, as for the secondary education, when students reach high school, they will only have 4 years to move from elementary level algebra and geometry to college level trigonometry, algebra or calculus depending on their career path and interest. I do not work in secondary schools ; however, it is my understanding that traditionally many students must take a math course in the summer if they wish to take college level calculus or math in high school. In other words, if a student takes Algebra I, Algebra II, Geometry, Trigonometry and Calculus, these students must complete five math courses in four years. Also, they will need college level algebra such as vector algebra and matrix algebra before calculus . Therefore, students who enroll in advanced and college level math and science courses in high school cannot complete all of the requirements in four years without an extra course load. Also, in the secondary grades, second year physics and college physics cannot be taught without calculus. I know because I took second year physics in high school and our instructor taught us pre-calculus before we could complete the course. It was enough to get me an A my first month in college calculus until my grades dropped drastically. Geometry should not be put off until middle school or fifth grade because it puts a tremendous pressure on students to "catch up" with prerequisite courses in high school and college.
In order for students to experience success in secondary level math and science, they must have a solid foundation in elementary science and math . Physics depends on calculus and chemistry uses algebra. In elementary school, often students are taught to memorize facts but not the connections with math and science. Also, certain topics are not seen as important in elementary education. However, if a student selects a career in science, they will have to work very hard and "double up on math" in secondary grades and this is not fair. Therefore, it is essential that students receive geometry from K5-through the secondary grades. Students may not know their career choice in elementary school and therefore they need exposure to all branches of mathematics in the primary grades.
As far as an example of "inductive reasoning" in mathematics, the seventh grade math class where students where students developed their own formulas for the volume of a cylinder is an example of inductive reasoning. The students were shown a circle ( a lid) and the instructor moved the lid through space to create a cylinder and then asked the students to develop formulas for a cylinder. She did provide prompts and the students completed this activity as a group. However, if the students had completed this assignment independently and made observations about cylinders while recording the observations in a journal that process would have involved inductive reasoning. Basically, when students make observations about things in nature or the real world and then record these as generalizations in a journal that is inductive reasoning. The generalizations made from these observations are part of the process of inductive reasoning. An example of deductive reasoning is providing a student with algorithms and asking them to compute the correct answer. It is interesting because I have never allowed students to create solids from nets and perform computations without giving them the formulas beforehand. I usually provide the students with the formulas. Usually, I would have given the students the formula V= , the dimensions of the cylinder and ask them to compute the volume. However, I can see how allowing students to create space figures and develop formulas for this figures will assist students to better understand the concepts.
Finally, if students wish to have careers in certain branches of the military , engineering or science they will need geometry as well as arithmetic. One cannot do vector algebra or vector calculus without it. It is very important for educators to help students to make connections between science and math and to understand the real world applications for this knowledge.
Activities that I will Incorporate Into My Lessons
I will incorporate the suggested activity –The Platonic Solids. I have taught lessons with 3-5 grade classes using nets to create geometric solids. However, after reviewing the suggested activities in the workshop, I would like to use polyhedron nets to create hexahedrons (cubes), tetrahedron ( triangular pyramids , and dodecahedrons ( such as decagonal prism or elongated square dipyramid). The students would be able to identify the Platonic Solid after constructing the solid using nets and then identify the properties of the solids.