# USING ALGEBRA TILES EFFECTIVELY

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1 MATHEMATICS USING ALGEBRA TILES EFFECTIVELY TOOLS FOR UNDERSTANDING by Bettye C. Hall Reviewers James Gates, Ed.D. Yvonne S. Gentzler, Ph.D.

2 AUTHOR Bettye C. Hall is the former Director of Mathematics in the Houston Unified School District in Houston, Texas. Ms. Hall, admired as a teacher s teacher because of her practical perspective on students and teachers needs, is active as a mathematics consultant, speaker, and workshop leader throughout the United States. REVIEWERS JAMES GATES, ED.D. Executive Director Emeritus, National Council of Teachers of Mathematics YVONNE S. GENTZLER, PH.D. Associate Professor, College of Education, University of Idaho Copyright 1999 by Prentice-Hall, Inc., Upper Saddle River, New Jersey All rights reserved. Worksheets and tests may be duplicated for classroom use, the number not to exceed the number of students in each class. Notice of copyright must appear on all copies. No other part of this book may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage or retrieval systems, without permission in writing from the publisher. Printed in the United States of America.

3 PRENTICE HALL MATH USING ALGEBRA TILES EFFECTIVELY TOOLS FOR UNDERSTANDING Contents Professional Development Overview iv Introduction vi Using Algebra Tiles Effectively Workshop Pre-Workshop Preparation Workshop Topics Workshop Opening: Examining the Algebra Tiles Activity 1: Adding Integers Activity 2: Subtracting Integers Activity 3: Simplifying Algebraic Expressions Activity 4: Solving Linear Equations Activity 5: Solving Word Problems with Algebra Tiles Activity 6: Modeling, Adding, and Subtracting Polynomials Activity 7: Multiplying Polynomials Activity 8: Factoring Polynomials Workshop Closing Visual Aids

4 Introducing a new, hands-on Professional Development package from Prentice Hall. Now, all the algebra tiles resources you need in one place to effectively train your trainers. With this new package, all educators can better utilize algebra tiles to reach today s students. New users are given the support they need to start using algebra tiles in the classroom right away. Experienced users are provided with a host of new applications. Comprehensive, train-the-trainer package... Fully-developed algebra tiles workshop Written-out scripts that are easy to follow Activities for various levels Visual Aid masters for transparencies Ideas for customizing the workshop for middle grades and high school teachers Suggestions for additional resources, including Internet site... written by an expert in the field. Workshop crafted by a leading educator, with expertise in using algebra tiles, professional development, and curriculum support Meets a range of classroom needs Can be customized to your middle grades or high school curriculum Allows you to effectively and easily train your trainers

5 Two more professional development exclusives from Prentice Hall: Annual Math and Technology Summer Institutes Two-day interactive institutes for middle grades and high school mathematics educators Providing new ideas on how to utilize technology to reach today s students Highlighting strategies for improving student performance on standardized tests Held each June in cities across the country Led by Dr. Jim Gates, Director Emeritus of NCTM, and other leading educators Prentice Hall Internet Home Page Faculty Forum: an on-line place to dialogue about topics of interest and to share ideas Professional Library, containing a number of handbooks for educators Links to sites about grants and fellowships, professional organizations, departments of education, school sites, and more Teacher support for projects, activities, etc., related to Prentice Hall s new series of math textbooks for Grades 6 12 Visit us at: PRENTICE HALL Reaching today s students For more information, call

6 Introducing a new, hands-on Professional Development package from Prentice Hall. Now, all the algebra tiles resources you need in one place to effectively train your trainers. With this new package, all educators can better utilize algebra tiles to reach today s students. New users are given the support they need to start using algebra tiles in the classroom right away. Experienced users are provided with a host of new applications. Comprehensive, train-the-trainer package... Fully-developed algebra tiles workshop Written-out scripts that are easy to follow Activities for various levels Visual Aid masters for transparencies Ideas for customizing the workshop for middle grades and high school teachers Suggestions for additional resources, including Internet site... written by an expert in the field. Workshop crafted by a leading educator, with expertise in using algebra tiles, professional development, and curriculum support Meets a range of classroom needs Can be customized to your middle grades or high school curriculum Allows you to effectively and easily train your trainers iv Using Algebra Tiles Effectively

7 Two more professional development exclusives from Prentice Hall: Annual Math and Technology Summer Institutes Two-day interactive institutes for middle grades and high school mathematics educators Providing new ideas on how to utilize technology to reach today s students Highlighting strategies for improving student performance on standardized tests Held each June in cities across the country Led by Dr. Jim Gates, Director Emeritus of NCTM, and other leading educators Prentice Hall Internet Home Page Faculty Forum: an on-line place to dialogue about topics of interest and to share ideas Professional Library, containing a number of handbooks for educators Links to sites about grants and fellowships, professional organizations, departments of education, school sites, and more Teacher support for projects, activities, etc., related to Prentice Hall s new series of math textbooks for Grades 6 12 Visit us at: PRENTICE HALL Reaching today s students For more information, call Using Algebra Tiles Effectively v

8 Algebra Tiles: Tools for Understanding Purposes of the Professional Development Workshop Today s mathematics teachers face tremendous challenges, including changes in curricula, teaching techniques, and assessment practices. To help teachers rise to these teaching challenges and opportunities, Prentice Hall presents this self-contained train the trainer workshop, developed by nationally-recognized and respected mathematics educators. This workshop is designed to aid educators in meeting the diverse needs and expectations of their students. The introduction of algebra tiles and other manipulatives into the classroom provides mathematics teachers with exciting opportunities to empower students of all learning styles. Through hands-on activities, this workshop will help teachers become familiar with the uses and applications of algebra tiles. New users will become comfortable using algebra tiles in their classrooms. Experienced users will learn new applications. All users will more fully appreciate the ways that these manipulative tools can help them reach a greater percentage of students. Components of This Workshop This workshop contains activities and visual aid masters that are suitable for use by staff developers, department chairpersons, curriculum specialists, or lead teachers in conducting a workshop on using algebra tiles effectively. This workshop also includes a statement regarding the purpose of the workshop, the intended audience, a list of necessary pre-workshop materials and audio-visual requirements, as well as suggestions for room preparation. Because of the wide variety of activities provided, middle school, high school, firstyear, and veteran teachers will all benefit from this program. The activities can be customized to accommodate different needs and levels of understanding. Trainers can select the activities that best meet their specific time constraints and professional requirements. You can introduce the session using any of a variety of ideas that are presented at the beginning. Next, there is a variety of activities designed to address the workshop goals and objectives. At the end of the workshop are summary ideas and suggestions for closing activities. The workshop contains masters for making transparencies or black line copies of the visual aids. vi Using Algebra Tiles Effectively

9 Facilitator s Roles and Responsibilities As facilitator, you should read through the workshop to become familiar with the objectives and activities. If any of the material is new to you, explore it thoroughly. Select the activities that best suit the needs of the educators attending your workshop. Each section and activity includes the suggested amount of time deemed necessary to accomplish the goal of the activity. Create a reasonable schedule for your workshop, being sure to allow time for exploration and questions. Suggestions for Getting Started Introduce yourself. Workshop participants may or may not know each other. If the latter is true, set aside a few minutes for members of the group to get acquainted with one another. Encourage them to talk about their own experiences and their students experiences using algebra tiles. This should ease participant anxiety. Customizing the Workshop As is always the case, knowledge is best understood and interpreted when it meets the needs of the learner. Knowing the needs of the group to be served, the facilitator will be in the best position to customize the workshop. This workshop, Using Algebra Tiles Effectively, contains a sufficient variety of activities so that you can use the workshop with middle grade teachers or high school teachers, educators new to using algebra tiles or educators experienced at teaching with manipulatives and algebra tiles or any combination of these groups. On page 2 of the workshop is a table containing the activities and suggested amount of time necessary to accomplish each activity. Use this table to determine which activities you will use in this workshop. Using Algebra Tiles Effectively vii

10 Using Algebra Tiles Effectively (x + 3)(x 2) = x 2 + x 6 When I listen, I hear. When I see, I remember. But when I do, then I understand. This workshop helps participants use algebra tiles effectively in their classrooms. Purpose Middle School and/or High School Teachers Materials Algebra tiles (1 set for every two participants) Flip charts or large pieces of newsprint for recording drawings and number sentences. Crayons or colored markers (for each group) Participants Pre-Workshop Preparation Audio-Visual Requirements Overhead projector and screen Algebra tiles for the overhead projector Blank transparency film and pens for transparencies Transparencies of Visual Aids 1, 2, 3, 4, 5A, 5B, 6A, 6B, 7A, 7B, 8A, 8B, 9A, 9B Room Preparation 1. Select desks or tables with flat tops as workspaces. 2. Arrange tables to accommodate groups of two or four. 3. Provide sufficient wall space for posting summaries of group discussions on flip charts or newsprint. USING ALGEBRA TILES EFFECTIVELY 1

11 Because many teachers were not exposed to manipulative activities as students, they do not use hands-on activities with their classes. In this workshop, the Facilitator acts as the teacher and models the lessons on an overhead projector. The participants act as students and experience the benefits of hands-on activities. Workshop Approach Activity Level Materials Time Workshop Topics WORKSHOP OPENING Examining the Algebra Tiles ACTIVITY 1 Adding Integers All Participants Visual Aid 1 10 minutes Middle School Teachers Tiles: x, +1, 1 Visual Aid 2 10 minutes In addition to the Opening and Closing components, choose at least two activities that best suit your group and your time constraints. ACTIVITY 2 Subtracting Integers Middle School Teachers Tiles: x, +1, 1 Visual Aid 3 10 minutes ACTIVITY 3 Simplifying Algebraic Expressions Middle School and Algebra I Teachers Tiles: x, +1, 1 Visual Aid 4 10 minutes ACTIVITY 4 Solving Linear Equations ACTIVITY 5 Solving Word Problems with Algebra Tiles Middle School and Algebra I Teachers Middle School and Algebra I Teachers Tiles: x, +1, 1 Visual Aids 5A, 5B Tiles: x, +1, 1 Visual Aids 6A, 6B 15 minutes 10 minutes ACTIVITY 6 Adding and Subtracting Polynomials ACTIVITY 7 Multiplying Polynomials ACTIVITY 8 Factoring Polynomials Algebra I and Algebra II Teachers Algebra I and Algebra II Teachers Algebra I and Algebra II Teachers Tiles: x 2, x, x, +1, 1 Visual Aids 7A, 7B Tiles: x 2, x 2, x, x, +1, 1 Visual Aids 8A, 8B Tiles: x 2, x 2, x, x, +1, 1 Visual Aids 9A, 9B WORKSHOP CLOSING All Participants Recordings from each group 15 minutes 15 minutes 15 minutes 10 minutes 2 USING ALGEBRA TILES EFFECTIVELY

12 In this workshop, the Facilitator acts as the teacher and models the lessons on an overhead projector. The participants act as students and experience the benefits of hands-on activities in math classrooms. Welcome Participants (5 minutes) 1. After you introduce yourself, discuss the purpose of the workshop: Say: The purpose of this workshop is to help you help your students learn how to use algebra tiles effectively. Say: Algebra tiles help to develop concepts related to integers, algebraic expressions, equations, and polynomials. Workshop Opening: Examining the Algebra Tiles The Facilitator works with Visual Aid 1 and algebra tiles on the overhead projector while participants work in pairs, or in groups of 4, at their desks. Materials: Visual Aid 1 Algebra tiles for the overhead projector Algebra tiles for each group Newsprint or large paper sheets 2. Explain the approach you will use in the workshop. Say: In this workshop, I, as the Facilitator, will act as the teacher. I ll use algebra tiles and Visual Aid transparencies to model the activities on an overhead projector. You, the participants, will act as students and experience the benefits of hands-on activities in math classrooms. 3. Tell participants which activities you will use in the workshop. When appropriate, pictures of models will appear in this column. Choose at least two activities in addition to the workshop opening and closing. USING ALGEBRA TILES EFFECTIVELY 3

13 Examine the Algebra Tiles (5 minutes) 4. Have participants spread the algebra tiles on their worktables and examine them. Note Use a transparency of Visual Aid 1. Place algebra tiles on the transparency. 5. Discuss the colors and shapes of the different algebra tiles x x x 2 x 2 Ask questions such as: Ask: What do you notice about all the negative tiles, 1, x, and x 2? Answer: All the negative tiles are red. 6. Have participants store the tiles in a corner of their worktables so they will have room to make models in the center of their tables. 7. Inform participants that they will use the newsprint to record their findings by drawing the models and writing the number sentences and equations they will create in the workshop activities. Classroom Applications Encourage participants to consult the Teacher s Editions for Prentice Hall Middle Grades Math, Prentice Hall Algebra, or Prentice Hall Advanced Algebra for classroom activities related to algebra tiles. 4 USING ALGEBRA TILES EFFECTIVELY

17 One pre-service teacher commented about the class in which he was a substitute teacher: They just don t get it unless they use the tiles. I ve tried without them, and it just doesn t work. Simplifying Algebraic Expressions (15 minutes) Activity 3: Simplifying Algebraic Expressions The Facilitator works with algebra tiles on the overhead projector while participants work at their desks in pairs or in groups of 4. Materials: +1 tile 1 tile 1. Describe the algebra tiles the participants will use. Point out that negative tiles are red. x tile x tile 2. Write this expression on the chalkboard or on a transparency: Write: 5 + 4x Ask: How can we model this expression? Give participants an opportunity to respond. Then model the expression with the group. 3. Write this expression on the chalkboard or on a transparency: Write: 3x + 2 4x 5 Say: Before we model this expression, remember that subtracting is the same as adding the opposite, so we can write the expression as 3x ( 4x) + ( 5). Ask: How can we model this expression? Give participants an opportunity to respond. Then model the expression with the group. Visual Aid 4 Newsprint 5 + 4x 3x + 2 4x 5 8 USING ALGEBRA TILES EFFECTIVELY

19 Algebra tiles can help students develop concepts related to integers, algebraic expressions, equations, and polynomials. Activity 4: Solving Linear Equations Solving Linear Equations (15 minutes) The Facilitator works with algebra tiles on the overhead projector while participants work at their desks in pairs or in groups of 4. Materials: +1 tile 1 tile 1. Describe the algebra tiles, shown at the right, that the participants will use. Point out that negative tiles are red. x tile x tile 2. Write this expression on the chalkboard or on a transparency: Write: x 2 = 7 Ask: How can we model this equation? Give participants an opportunity to respond. Then model the equation. Point out that just as the two sides of an equation are separated by an equals sign, the two parts of the equation are separated by the bar in the model. Visual Aid 5 Newsprint x 2 = 7 Ask: How can we use algebra tiles to solve this equation? Give participants an opportunity to respond. Say: To isolate the variable, that is, to get the x tile alone, add 2 positive tiles to each side of the equation. Remove the zero pairs to show the solution. Ask: What is the solution? Answer: x = 9 10 USING ALGEBRA TILES EFFECTIVELY

21 In this activity you will challenge participants to work in cooperative groups to analyze a word problem, determine how they can use algebra tiles to model the problem, and how they can use algebra tiles to solve the problem. Using Algebra Tiles to Solve a Word Problem (10 minutes) 1. Read this problem to participants or display a transparency of Visual Aid 6A. A total of 38 students from two schools attended a mathematics tournament. Six students from Jefferson High School rode bicycles. The rest were transported in three cars. Seven students from Lincoln Middle School rode bicycles. The rest were transported in two cars. If all the cars transported the same number of students, how many students rode in each car? 2. Tell participants they will work together in their groups for 5 minutes to: Write an equation for the problem. Model the problem with algebra tiles. Solve the problem. Activity 5: Solving Word Problems with Algebra Tiles Materials: Each group of 4 participants needs enough algebra tiles to represent 51 unit tiles and 5 x-tiles. Visual Aids 6A, 6B Use a transparency of Visual Aid 6A to present the problem. Allow 5 minutes. Remind students to record their models and equations. Equation: 3x x + 7 = After 5 minutes display a transparency of Visual Aid 6B on the overhead projector. Discuss the equation, the models, and the solution with participants. Uncover the transparency for Visual Aid 6B row by row. Classroom Applications Encourage participants to consult the Teacher s Editions for Prentice Hall Middle Grades Math, Prentice Hall Algebra, or Prentice Hall Advanced Algebra for further classroom activities related to problem solving. 12 USING ALGEBRA TILES EFFECTIVELY

24 In this activity participants will use rectangular arrays to model the product of two polynomials. You can relate the multiplication of polynomials to a basic whole-number multiplication table. Place the first factor vertically under the multiplication dot. Place the second factor horizontally to the right of the multiplication dot. Multiplying Polynomials (15 minutes) 1. Review the meaning of each algebra tile with participants. Activity 7: Multiplying Polynomials Materials: +1 1 x x x 2 x 2 Visual Aids 1, 8A, 8B Newsprint 2. Ask participants how the table on Visual Aid 8A shows basic multiplication facts. Ask: How can we find the product 3 4 in this table? Ask: What is the product of 3 4? Use Visual Aid 8A. Answer: Find the entry to the right of 3 and under = Help participants relate a basic multiplication table to a rectangular array to model the multiplication of polynomials. Ask: How can we model the multiplication of (x + 3)(x 2)? Elicit the fact that algebra tiles that represent the first factor (x + 3) are placed on the vertical axis and algebra tiles that represent the second factor (x 2) are placed on the horizontal axis. (x + 3) (x 2) USING ALGEBRA TILES EFFECTIVELY 15

26 In this activity participants will use rectangular arrays to model factoring polynomials. Relate factoring polynomials to Activity 7, Multiplying Polynomials. The first factor is placed vertically under the multiplication dot. The second factor is placed horizontally to the right of the multiplication dot. Factoring Polynomials (15 minutes) 1. Review the meaning of each algebra tile with participants. Activity 8: Factoring Polynomials Materials: +1 1 x x x 2 x 2 Visual Aids 1, 9A, 9B Newsprint 2. Briefly review Multiplying Polynomials. Ask: How can we model the multiplication of (x + 3)(x 2)? Elicit the fact that algebra tiles that represent the first factor (x + 3) are placed on the vertical axis and algebra tiles that represent the second factor (x 2) are placed on the horizontal axis. Give participants a chance to respond. Then model the multiplication with algebra tiles on the overhead projector. 3. Show the model at the right on the overhead projector. (x + 3)(x 2) = x 2 + x 6 Use a transparency of Visual Aid 8A or model the expression with algebra tiles on the overhead projector. Call attention to the fact that the model shows a rectangular array with the tiles arranged in descending order. Ask: What expression does this model represent? Answer: x 2 + 4x 3x 12 USING ALGEBRA TILES EFFECTIVELY 17

28 While a representative from each group displays the pages with the group s recordings, you may wish to collect the algebra tiles and other materials that must be returned. Closing Activities (10 minutes) Workshop Closing: Recapping the Activities 1. Have a representative from each group display around the room the recordings (drawings, number sentences, equations) from that group. 2. Recap the activities that have been presented and end by having participants discuss what they have learned and how they can use it. Ask: How can the activities that we worked on today have an impact on students in your classroom from now on? 3. Stress with participants the importance of continuing to experiment with algebra tiles in their classrooms. Say: Remember, algebra tiles can help students develop concepts related to integers, algebraic expressions, equations, and polynomials. 4. You may wish to refer your group to any worthwhile articles, books, or Web sites with which you are familiar. 5. Take any questions that remain. 6. Collect all algebra tiles and other materials that have been distributed. For more professional development information and training materials, visit the Prentice Hall site: 7. You may wish to close with the quotation that introduced this professional development workshop: Say: Remember: When I listen, I hear. When I see, I remember. But when I do, then I understand. USING ALGEBRA TILES EFFECTIVELY 19

29 VISUAL AID 1 WORKING WITH ALGEBRA TILES +1 1 x x x 2 x 2 20 USING ALGEBRA TILES EFFECTIVELY 1999 Prentice-Hall, Inc.

30 VISUAL AID 2 ADDING INTEGERS Use algebra tiles to find the following sums. Write a number sentence for each. Record your models and number sentences. Expression Model/Answer 4 + ( 9) 4 + ( 9) = ( 8) 3 + ( 8) = ( 3) 9 + ( 3) = 6 USING ALGEBRA TILES EFFECTIVELY 1999 Prentice-Hall, Inc. 21

31 VISUAL AID 3 SUBTRACTING INTEGERS Model these differences and sums with algebra tiles. Write a number sentence for each. Record your models and number sentences. Expression Model/Answer = ( 6) 2 + ( 6) = = ( 8) 3 + ( 8) = USING ALGEBRA TILES EFFECTIVELY 1999 Prentice-Hall, Inc.

32 VISUAL AID 4 SIMPLIFYING ALGEBRAIC EXPRESSIONS Simplify these expressions. Record your findings. Expression Model/Answer 4x + 8 3x 4x + 8 3x = x + 8 5x 9 2 3x 5x 9 2 3x = 2x 11 3x x 6 3x x 6 = 2x + 1 USING ALGEBRA TILES EFFECTIVELY 1999 Prentice-Hall, Inc. 23

33 VISUAL AID 5A SOLVING LINEAR EQUATIONS Model this equation with algebra tiles. Use the model to solve the equation. Record your findings. Equation 3x 2 = 4 3x 2 = 4 Model/Answer Add two positive tiles to each side. Then remove zero pairs. 3x = 6 Divide. x = 2 24 USING ALGEBRA TILES EFFECTIVELY 1999 Prentice-Hall, Inc.

34 VISUAL AID 5B SOLVING LINEAR EQUATIONS Model this equation with algebra tiles. Use the model to solve the equation. Record your findings. 5x + 6 = 4 Add six negative tiles to each side. Then remove zero pairs. 5x = 10 Divide. x = 2 USING ALGEBRA TILES EFFECTIVELY 1999 Prentice-Hall, Inc. 25

35 VISUAL AID 6A SOLVING WORD PROBLEMS Model the word problem with algebra tiles. Use the model to solve the problem. Record your findings. A total of 38 students from two schools attended a mathematics tournament. Six students from Jefferson High School rode bicycles. The rest were transported in three cars. Seven students from Lincoln Middle School rode bicycles. The rest were transported in two cars. If all the cars transported the same number of students, how many students rode in each car? 26 USING ALGEBRA TILES EFFECTIVELY 1999 Prentice-Hall, Inc.

36 VISUAL AID 6B SOLVING WORD PROBLEMS Use the model for Visual Aid 6A. Solve the word problem. Record your findings. 3x x + 7 = 38 Simplify the left side of the equation. Add 13 to each side of the equation to form zero pairs. Remove zero pairs. 5x = 25 x = 5 Five students rode in each car. USING ALGEBRA TILES EFFECTIVELY 1999 Prentice-Hall, Inc. 27

37 VISUAL AID 7A ADDING POLYNOMIALS Use algebra tiles to find the following sum. Write an equation for the addition. Record your model and equation. Expression (3x 2 + 2x 4) + ( 2x 2 + x 3) Model/Answer (3x 2 + 2x 4) + ( 2x 2 + x 3) = x 2 + 3x 7 28 USING ALGEBRA TILES EFFECTIVELY 1999 Prentice-Hall, Inc.

38 VISUAL AID 7B SUBTRACTING POLYNOMIALS Use algebra tiles to subtract. Write an equation for the subtraction. Record your model and equation. Remember: Subtraction is adding the inverse number. Expression (2x 2 + 2x 1) (x 2 x + 3) Model/Answer (2x 2 + 2x 1) (x 2 x + 3) = x 2 + 3x 4 USING ALGEBRA TILES EFFECTIVELY 1999 Prentice-Hall, Inc. 29

39 VISUAL AID 8A MULTIPLYING POLYNOMIALS = 12 Model this multiplication with algebra tiles. Record your findings. Multiply Model/Answer (x 1)(x 4) x 2 5x USING ALGEBRA TILES EFFECTIVELY 1999 Prentice-Hall, Inc.

40 VISUAL AID 8B MULTIPLYING POLYNOMIALS Model this multiplication with algebra tiles. Record your findings. ( 2x + 2)(x 3) Answer: 2x 2 + 8x 6 USING ALGEBRA TILES EFFECTIVELY 1999 Prentice-Hall, Inc. 31

41 VISUAL AID 9A FACTORING POLYNOMIALS Use algebra tiles to factor this trinomial. Record your findings. Factor Model/Answer x 2 + 5x + 6 Answer: x 2 + 5x + 6 = (x + 2)(x + 3) 32 USING ALGEBRA TILES EFFECTIVELY 1999 Prentice-Hall, Inc.

42 VISUAL AID 9B Use algebra tiles to factor this trinomial. Record your findings. Factor Model/Answer x 2 7x + 12 Answer: x 2 7x + 12 = (x 4)(x 3) USING ALGEBRA TILES EFFECTIVELY 1999 Prentice-Hall, Inc. 33

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