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Anna Smoak Short Range Lesson Plan Title of Lesson: Combining Like Terms Subject: Algebra I Grade level: 9th Teacher: Ms. Burgess Objective(s): Students will be able to communicate verbally and in writing the definition of like terms Students will be able to identify like terms in polynomial expressions Students will be able to mathematically combine like terms in polynomial expressions Students will be able to generate examples and non-examples of like terms Students will be able to apply knowledge of like terms to practical situations SCSDE Curriculum Standard(s) Addressed: EA-2.7 Carry out a procedure (including addition, subtraction, multiplication, and division by a monomial) to simplify polynomial expressions. NCTM National Curriculum Standard(s) Addressed: Algebra: Represent and analyze mathematical situations and structures using algebraic symbols (grades 9-12) Use symbolic algebra to represent and explain mathematical relationships Communication: Organize and consolidate their mathematical thinking through communication Communicate their mathematical thinking coherently and clearly to peers, teachers, and others Prerequisites: Students must be able to recognize as well as add and subtract monomials Students must be able to distribute a constant through a polynomial Students must be able to add, subtract, and multiply real numbers Students must be able to translate a word problem into a mathematical expression Materials/Preparation: Smartboard and whiteboard will be used Powerpoint or Smart presentation will be minimized and ready for immediate use Students must have notebooks and pencils Procedures: Introductory Activity (5 minutes): o Student will use their prior knowledge of similarity to group apples and oranges into similar groups. o Student will be asked to explain their procedure for choosing which items were similar to the class. o Students will be prompted to explain their strategies for sorting the fruit into two distinct groups. o Students will then generate ideas of how to simplify their groups. o As a class we will review the natural steps we took to combine our like terms collect like terms simplify Main Activity (20 minutes): o Similar to the introductory activity, students will group similar algebra tiles (which contain only x values and constant terms). After several minutes to consider the problem, I will ask for student solution strategies, their reasoning, procedure, and any possible alternatives. It will be noted that our procedure for combining like terms is the same in this algebra example as it was in our fruit example. o Students will then be asked to explain why they had to stop the procedure when all of their variables were together and all of their constants were together. o Students will work in pairs to discuss if two different variables can be added together and then be asked to explain their reasoning to the class. o Another algebra tiles activity which contains x2, x, and constant terms will be presented. Students will explain if their procedure from the previous two examples will still work with the introduction of x2 and negative values. Students will be asked to explain why we are not able to add our x2 values to our x values. o Students will then be asked to explain the role of the 5 in the term 5x, the role of the x in 5x, and the role of -5 in -5x. This leads into our discussion of coefficients. o Students will work problems in pairs to complete a chart where they must decide if two terms are like or not like and explain why. I will walk around the room to monitor their conversations and work. Each pair will answer one of the problems to the class as a whole and explain their reasoning. The rest of the class will be asked to agree or disagree with the pair. o Students will then be presented with algebraic expressions without algebra tiles for the first time. I will ask for suggestions for what to do during each step of simplifying the expression. o Students will be given a word problem and be asked to write it in algebraic form and then simplify it by using the method of combining like terms. We will first read through the problem together and circle the words that tell us what operations are being performed. We will then write the expression and simplify it by using a t-chart where we show our work on the left hand side and state our steps on the right hand side. Closure (10 minutes): o The teacher will present students with a formal set of rules for combining like terms and review the steps necessary to complete any problem using the process of combining like terms. o The teacher will present several student responses from the SCLA given to the class the previous week where students were asked to provide one real-life example of combining like terms. We will review each of these examples and identify what makes these good examples and what could make them better examples. (I decided to do this activity because a common theme between my lesson plans is a ticket out of the door. My students are not used to this type of closing activity and I believe that to help them with this new task I must show them what I value and what I expect in a written mathematical response. Having them evaluate their own examples and examples of others also gives them an opportunity to discuss as a class what makes a good example and what can be done to make an example better.) o As a ticket out of the door students will be asked to either give one real-life example of combining like terms or explain the process of combining like terms to a friend who was absent from class. Assessment: Students can correctly answer conceptual questions about the day’s lesson such as why can we not add two different variables together? Why can we not add a variable and a constant together? Why must the degree of variables be the same for them to be added? Students can successfully complete written in class and homework problems which require students to simplify expressions with both positive and negative signs Students will complete a “ticket out of the door” activity as explained above to demonstrate their understanding of the day’s lesson Adaptations: Students have the opportunity to come in during their AE period or tutoring after school for extra assistance The lesson will begin with several concrete examples to help all of the students draw from prior knowledge of sorting and combining similar objects Students will work together during the lesson to identify like terms and discuss their solution strategies amongst themselves and then present them to the class I will make text font larger for students who have difficulty seeing the board Follow-up Lessons/Activities: The beginning of the next lesson will include a review of combining like terms Students may complete an optional worksheet for more practice Reflection: Clemson: I taught this lesson with Solari Garren as our team presentation. During this lecture I was given the advice to add a slide that allowed students to use algebra tiles to simplify an expression that contained x2, x, and constant terms. Teaching this lesson to our class helped me get a sense of the timing of the lesson and the responses I was going to be looking for when teaching this lesson to my students. After giving an SCLA to my students (a requirement for READ 498), I realized that students were not familiar with the term “coefficient,” which is a major vocabulary term in this unit. I decided to use the method of verbal mediation to help students remember this term because it is a word they will not only be expected to recognize on their departmentalized tests but also use to communicate with teachers and peers throughout their mathematical careers. From this SCLA I also determined that students were not sure of how the process of combining like terms can be used in the everyday world (only 3 of the students came up with examples). This helped me decide to include examples of student work from the SCLA in my presentation to help students gain an understanding of what an acceptable response must include as well as what constitutes an excellent response. Wren: I was very pleased with the level of student interaction during my lesson. Students usually do not talk in this class and are accustomed to simply listening to the lecture and taking notes. At first students were shy about responding but after going through a few slides they realized that the lecture has highly dependent on their feedback and ideas. The only part of the lesson that I would have changed would be to greater emphasize why we cannot add x2 to x. Students were able to see this during the algebra tiles exercise, but I think that I should have spent more time emphasizing this point. Students’ ticket out of the door activity was based on two of the questions I asked them during the SCLA. After reviewing student SCLA responses during the lesson I was very happy with the activity responses I received from students. During the SCLA only three students could give real-life situations for combining like terms and no one answered the question about explaining the process of combining like terms to a friend. However, their ticket-out-of-the-door responses were excellent. Even the students who responded well during the SCLA improved their responses during their exit activity. While I did not tell the class the names of the students whose examples I was showing, the students were very excited to see samples of their work on the board and told everyone that it was their work. I feel that all of the students were engaged (this is a class of only 13 students so I was able to give them more one-on-one attention than I would be able to do for a class of 30). Students expressed that they enjoyed the lesson than stated that they wished that every math lesson was taught beginning at such a basic level (starting with apples and oranges “because they make sense” and moving to algebraic representations).

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posted: | 5/23/2013 |

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