# Name of Lesson: Properties of Equality A Review. Mathematical Topic: The Four Properties of Equality. Course: Algebra I

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1 Name of Lesson: Properties of Equality A Review Mathematical Topic: The Four Properties of Equality Course: Algebra I Time Allocation: One (1) 56 minute period Pre-requisite Knowledge: The students will have been introduced to all of the properties of equality in previous lessons. This lesson is designed as a review activity where all of the properties are brought together in the process of solving simple single variable equations. Objectives: The students will: 1. Be able to identify and define the four properties of equality presented 2. Be able to solve single variable equations having one or two steps. 3. Be able to apply the four properties of equality to solving a variety of simple single simple variable equations as described above. Materials: 1. TI-84 Plus Silver Edition with Algebra 1 Part 1 (ALG1PRT1) application. 2. Activity Worksheet One Properties of Equality 3. Activity Worksheet Two Free Fall 4. TI View Screen and overhead projector. Important Vocabulary: Procedure: 1. Isolate the variable the variable must be alone on one side of the equals or inequality sign and positive. 2. Inverse operation an operation that will undo another operation. For example, division is the inverse operation of multiplication. 3. Equivalent equations equations that have the same value, but are visually different. 1. Homework Review (10 15 minutes) 1.1 Ask students which problems they would like to review and what was it that made the problem a challenge (i.e. what did the student not understand). List the numbers on the board from top to bottom in ascending order and the information concerning what made the problem difficult. A student scribe may be used for this part. 1.2 Select student volunteers to help answer their peer s questions. This may range from a quick verbal answer to doing out the problem on the board in detail. The teacher must determine how in depth the

3 4. Homework Activity: FREE FALL. (5 minutes) 4.1 Students will play FREE FALL at the Silver Level and then the Gold Level completing the accompany Activity Sheet. Please indicate to the students that the Activity Sheets assigned for homework will be collected at the beginning of the next class. Follow-up: Students who have mastered the material will be able to solve single variable equations involving one or two steps and will be able to identify which properties of equality were applied in the process. After successful completion of this lesson, students will work with more complex single variable equations and apply the properties of equality in solving them. These more complex equations will have more than one constant, will have fractional answers in some cases and will lead in to the concept of combining like terms as it relates to solving equations. Assessment: The homework activity sheet will be collected and corrected. The teacher will determine if the concepts presented have become part of the class s skill set before moving on to more challenging problems using the Properties of Equality. If the class has not mastered the material, additional practice using the other handheld activities, such as SOLVE IT or BEAM DALE UP can be used. Use of more traditional worksheets may also be appropriate if the students are demonstrating an understanding of the general concepts, but making errors involving signs, starting with the wrong operation, etc. Resources: The activity is from the TI applications for the TI-84 Plus Silver Edition. The first activity sheet includes only the observation problems found on TI activity sheet 2-10 from Topics in Algebra 1, copy write 2001 Texas Instruments. The instructions for completing FREE FALL as found the lesson plan are copied with minor revision from TI activity sheet 2 19 from Topics in Algebra 1, copy write 2001, Texas Instruments. The FREE FALL activity sheet is of my own design, but does contain the instructions for the activity as adapted from the TI activity sheet 2 19 as referenced above.

4 ACTIVITY ONE PROPERTIES OF EQUALITY Name: Date: Period: Overview: In this activity you will be reviewing the properties of equality and comparing what is presented on the handheld to the information placed on the board by some of the class members. From this you will develop a working definition for each of the four properties of equality and a unique example for each. Instructions: 1. Press the ON button. 2. Press the APPS key. 3. Press 3 and ENTER. Press ENTER again. 4. Press 2 (LINEAR EQUATIONS) and 2 again (USING ALGEBRA). Press 1 (OVERVIEW) This brings you to the first screen for the application. Most of the navigation from this point forward will be accomplished using the arrow keys. 5. Press the right arrow key. 6. Follow the overview and advance through the screens using the right arrow key until you get to the Properties of Equality Screen as shown.. 7. You will start with the Addition Property of Equality. Once this is completed, including the three types of equations to be solved, you will work through the balance of the remaining properties of equality. When you reach a screen which indicates that the next section is ACTIVITIES and you have completed all of the overview material, including the questions on the back of this activity sheet, please stop.

5 Observations: Observation 1: x 5 = 8 Observation 2: (3/2)x = 9 Observation 3: 4 x = 10 For each of the four properties of equality listed below write your own definition based upon the handheld activity you just completed and what you learned in the previous class. Make sure to include the appropriate vocabulary, writing it in a way that someone who was unfamiliar with the property itself could understand it after reading you definition and reviewing your example. The Addition Property of Equality: The Subtraction Property of Equality: The Multiplication Property of Equality: The Division Property of Equality: Working with a neighbor, share your definitions and examples with each other. Give each other feedback and make changes to your definitions and examples as necessary.

7 GOLD LEVEL Round 1 Score: Round 2 Score: Round 3 Score: Round 4 Score:

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