The Math Without Borders Home Study Companion series provides a complete high school math experience for homeschoolers by supplementing the best existing high school math textbooks with solid teaching by an experienced teacher.
Home Study Companion: Algebra 1
Companion to Algebra 1: Expressions, Equations, and Applications, by Paul A. Foerster
Whiteboard video lessons covering the “classroom presentation” portion of a full high school Algebra 1 course based on Algebra 1: Expressions, Equations, and Applications by Paul Foerster.
Home Study Companion: Geometry
Companion to GeometryA Guided Inquiry, by G. D. Chakerian, Calvin D. Crabill, and Sherman K. Stein
Solution manual, with commentary, extensions, and nearly 300 dynamic demonstrations using Geogebra software designed to accompany the exceptional text, Geometry: A Guided Inquiry, by G.D. Chakerian, Calvin D. Crabill, and Sherman K. Stein. Now also includes a complete video introduction and video solution guide to the Review section of each chapter.
Home Study Companion: Algebra 2 with Trigonometry
Companion to Algebra and Trigonometry: Functions and Applications, by Paul A. Foerster
Whiteboard video lessons covering the “classroom presentation” portion of a full high school Algebra 2 course based on Algebra and Trigonometry: Functions and Applications by Paul Foerster. Also includes a video solution guide for a large selection of problems for each lesson.
(Here and here are two more Algebra 2 videos (from chapter 4) demonstrating how to use a spreadsheet to solve systems of 3 (or 5) equations for 3 (or 5) unknowns. The same method can be applied to problems requiring even more variables. Solving large systems of equations is common in circuit analysis in electronics. Educationally, learning how to program the solutions is an excellent way to learn the solution methods while not becoming overwhelmed by busywork. When you’re done, you also have a tool you can save and use later.
Home Study Companion: Precalculus
Companion to Precalculus with Trigonometry: Concepts and Applications, by Paul A. Foerster
Whiteboard video lessons covering the “classroom presentation” portion of a full high school Precalculus course based on Precalculus with Trigonometry: Concepts and Applications by Paul Foerster. Also includes a video solution guide for a large selection of problems for each lesson.
Home Study Companion: Calculus
Companion to Calculus Concepts and Applications, by Paul A. Foerster
Whiteboard video lessons covering the “classroom presentation” portion of a full year Calculus course based on Calculus: Concepts and Applications by Paul Foerster. Also includes a video solution guide for a large selection of problems for each lesson. This course is under development during the current school year with a limited number of students as a beta test group. It will be available for general use starting in the summer of 2015.
(About the Math Without Borders “Golden Logo”)

The challenge facing homeschool students and adults studying mathematics at home is that mathematics textbooks are not designed to be used alone. A lot goes on in a good math class besides reading the text and doing problem sets. Textbooks are designed to be taught by an experienced teacher. A good teacher should be able to:
 give an overview of the subject to “put the text in context.”
 model the thinking skills and strategies that go into analysis and problem solving.
 illustrate, demonstrate, and clarify (as well as prove) the underlying concepts.
 point out links between different parts of the subject and applications beyond what is in the text.
Rather than start from scratch with yet another textbook, I decided to start with the best existing textbooks (selected based on 35 years of teaching experience) and provide the kinds of additional support for home study students that a good teacher would provide in a classroom.
If you are looking for used math textbooks, visit ValoreBooks, a marketplace that aims to provide cheap textbooks.