Dr. Math Gets You Ready for Algebra: Learning PreAlgebra Is Easy! Just Ask Dr. Math!ISBN: 9780471225560
192 pages
August 2003, JosseyBass

Description
Getting ready to take your first algebra class? Don't panic. Making the leap from the concrete world of numbers and real objects to the abstract world of letters and symbols doesn't have to be as scary as it sounds. Dr. Math??the popular online math resource for students, parents, and teachersis here to help!
Students just like you have been turning to Dr. Math for years asking questions about math problems, and the math doctors at The Math Forum have helped them find the answers with lots of clear explanations and helpful hints. Now, with Dr. Math Gets You Ready for Algebra, you'll learn just what it takes to succeed in this subject. You'll find the answers to dozens of real questions from students who needed help understanding the basic math concepts in a typical prealgebra class. You'll learn all about basic algebraic operations and their connections to the real world. Pretty soon, everything from integers to singlevariable equations will make sense. Plus, you'll get plenty of tips for working with tricky problems.
You won't find a better introduction to the world and language of algebra anywhere!
Table of Contents
Introduction.
PART 1: Fundamental Operations
1. Introduction to Algebraic Thinking.
2. Variables.
3. Exponents.
4. Large and Small Numbers.
5. Order of Operations.
6. Distributive Property and Other Properties.
Resources on the Web.
PART 2: Integers.
1. Coordinate Graphing of Integers.
2. Origin of Integers.
3. Adding and Subtracting Integers.
4. Multiplying and Dividing Integers.
5. Absolute Value.
Resources on the Web.
PART 3: Real Numbers.
1. Rational Numbers.
2. Factoring.
3. Squares and Square Roots.
4. Irrational Numbers.
5. Pi.
6. Real Numbers.
Resources on the Web.
PART 4: Equations with Variables.
1. Solving Basic Equations.
2. Graphing Equations.
3. Equivalent Equations.
Resources on the Web.
PART 5: Algebra Applications.
1. Ratio and Proportion.
2. Area and Perimeter.
3. Distance, Rate, and Time Problems.
4. Rate of Work Problems.
Resources on the Web.
Glossary.
Index.
Author Information
Reviews
The book is well organized; its five sections include fundamental operations, integers, concepts of real numbers, equations with variables, and word problems and reallife situations. The questionandanswer format is excellent, and the explanations are easily read and understood. Also, Web resources for further exploration of concepts are included at the end of each section.
I shared this book with a colleague who teaches prealgebra. She was very impressed and expressed her desire to obtain this book for use in her classes. My firstyear algebra students were helped by the explanations of different concepts. This book would be an excellent additional resource in a prealgebra classroom, an algebra I classroom, or for individuals who need extra assistance with basic concepts of algebra.—Janie P. Bower, Hattiesburg High SchoolFreshman Academy, Hattiesburg, MS 39401. (Mathematics Teaching in the Middle School, Vol. 9, No. 9, May 2004)
The Math Forum’s Dr. Math Gets You Ready for
Algebra is a very userfriendly book written with a view to
help students make the leap from arithmetic to algebra. It is a
wellorganized collection of letters from students and answers
provided to them by the Math Forum’s "Ask Dr. Math" service.
The letters were written by actual students who were having
difficulty understanding concepts that are a basis for Algebra. The
answers were provided by trained volunteers who were drawn from a
pool of college students, mathematicians and teachers in the
mathematics community, and referred to collectively as "Dr. Math".
The answers are insightful and presented in an elegant and simple
manner that makes them accessible to any student.
The book is divided into five parts. Part I begins with interesting
questions such as "What is Algebra?" and "How does one start
thinking algebraically"? These are difficult questions to answer,
but Dr. Math does a very good job of giving simple, to the point,
and easy to understand explanations. This part also includes a
discussion of variables, exponents, scientific notation, infinity,
order of operations, the distributive property for polynomials,
etc..
The notion of a variable is explained in different ways, including
references to real life situations where the use of variables to
represent numbers we do not know yet is crucial. Dr. Math explains
how understanding the definition of an exponent easily leads to the
various properties of exponents. "He" then illustrates the use of
exponents and scientific notation to simplify the process of doing
numerical calculations by hand and to express some very large or
very small numbers. For instance, it is shown how
1.05^{120} can be calculated by hand with only 9
multiplications.
Infinity is a difficult concept for students to grasp. Dr. Math
gives an interesting explanation of infinity, emphasizing that
infinity is not a number. "He" then goes deeper to explain how
infinite sets are categorized into countably and uncountably
infinite, which I’m sure students would find interesting. Dr.
Math does an excellent job of explaining that PEMDAS is merely a
good convention for the order of the fundamental operations and
that you can use different orders of operations and come up with a
perfectly consistent mathematical system. To explain why the
distributive property for polynomials works the way it does, Dr.
Math neatly models multiplication of polynomials after
multiplication of numbers so that it looks familiar.
In Part II, Dr. Math explains the concept of integers. A detailed
account of how the fundamental operations work with integers is
given. To answer the frequently asked question, "Why is a negative
number times a negative number positive?", Dr. Math gives several
good explanations, as there is no single visualization that works
for everyone. This part ends with a discussion of absolute value,
along with some practical applications of this concept.
In Part III, Dr. Math introduces students to real numbers. A simple
and interesting discussion of why 0.999... = 1 and of what it means
for a decimal to repeat forever is given. The concepts of prime
factorization, greatest common factor and least common denominator
are explained thoroughly. Dr. Math shows how one can approximate
square roots by hand by repeated use of division and averages. This
leads to a discussion of irrational numbers, including a brief
history of π. The authors then help students visualize the
relationships between the sets of whole numbers, integers, rational
and irrational numbers as subsets of real numbers with the aid of
Venn diagrams.
In Part IV Dr. Math explains the importance of being able to solve
equations and gives highly detailed stepbystep instructions for
solving linear equations. Moreover, a neat explanation of why we
can subtract one equation from the other when solving a system of
two equations in two unknowns is given.
Part V, the concluding part of the book, aptly discusses
applications that demonstrate the uses of numbers, equations and
variables. Some of the problems described here deal with ratio and
proportion, area and perimeter, distance, rate and time, and rate
of work. Students having trouble with distance, rate and time
problems would definitely benefit from this section. Dr. Math
introduces these concepts with carefully chosen examples and does a
great job of explaining some tricky problems posed by students on
this topic.
In conclusion, this book cannot be used as a textbook but would
certainly be a very good reference for Prealgebra/Beginning Algebra
students and teachers. Its unique question and answer format makes
it interesting for students to read. The language is simple and
explanations are clear and precise. Prealgebra students will be
able to read this book by themselves. They will also be able to
relate to many of the questions in the book because they are likely
to have encountered similar questions during their course. Students
who do not have difficulty in understanding prealgebra will also
benefit from this book, as it will get them to think more deeply
about the concepts and clarify some misconceptions they might
have.
This book includes many great questions asked by students,
questions which would require some thought on the teacher’s
part to answer effectively on the spur of the moment. This makes
the book a good reference for prealgebra teachers. Moreover,
numerous web resources that provide practice problems, group
activities, real life applications etc. have been listed at the end
of each part of the book. Instructors could take advantage of these
web resources to enhance teaching and learning in the classroom.
(Mathematical Association of America Online)
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