Cheap and/or free CURRICULUM resources for homeschooling math

I will try to collect here a list of free or cheap math curriculum resources. They could be either a complete or partial curriculum, or curriculum-related, such as scope and sequence or diagnostic tests related.

MathTV.com
Over 4,000 free, online video lessons for basic math, algebra, trigonometry, and calculus. Videos also available in Spanish. I've written a review of MathTV lessons when they used to be offered on CDs.
www.mathtv.com/

Math Mammoth Blue Series Books
Covering topics from 1st to 5th grade, these inexpensive ebooks explain the concepts well and provide ample practice. Prices $2 to $5 per ebook. (Downloadable PDFs)

Mathematics Enhancement Programme - School curriculum materials
Entire workbooks to download (PDFs) for FREE for grades 1-10 for non-commercial purposes. These are good quality, too, and not just machine-made worksheet collections. Includes some interactive materials. Provided by Centre for Innovation in Mathematics Teaching.

DPI Instructional Services: Mathematics Resources
Lots to explore here. For example, worksheets with variable problems meant for review, some for each week of the school year: Week by week essentials, grades K-2, Grades 3-5, and Grades 6-8.

MINDsprinting
A free math program based on an online assessment test and assigned printable worksheets. Based on the samples, the math program seems basic and emphasizes calculation routines. But it's free.

Curriculum Improvement Project - PASS books
Free, yet complete, math books in downloadable form (PDF files) for algebra, pre-algebra, liberal arts mathematics, and other math courses from the Parallel Alternative Strategies for Students (PASS) Building General Math Skills. These books are written to help students with various learning needs and are presented in an easy-to-understand format. Teacher guides are also available.

Pre-algebra Study Guide worksheets
Over 100 very nice, compact prealgebra worksheets from the Glencoe Parent and Student Study Guide. The sheets have a short, instructional part that reviews the concept, several problems, and answers upside down in the end of each sheet.

Math eBooks
Various math ebooks available for free download on algebra 1, algebra 2, prealgebra, geometry, calculus, and other (mostly advanced) topics.

Totally Free Math
Elementary Algebra With Applications - a free math textbook to download or to view online (PDF form).

Exeter Math Course Materials
PDF files filled with problems for algebra, integrated high school math, calculus, discrete math, and multivariable calculus.

Math 911 Software
Mathematics Tutorial Software for pre-algebra, algebra, college algebra, trig, calculus, and statistics. Download for free till January 30, 2009.
math911.com

HippoCampus
Online interactive lessons (free) covering high school algebra and calculus courses (including AP calculus).

MathVids.com
Free math videos grouped by math topic. Basic math, middle school, high school, and college levels. Also includes links to further resources.

First-Lessons in Arithmetic, Jones Bros., 1878.
Free download. An arithmetic book from the past.

Understanding algebra
A complete online algebra text for Algebra I by James W. Brennan. Also a printable version.

Calculus Made Easy
A free download of an old textbook, acclaimed to be a lively introduction to calculus, with clarity and simplicity.

Mathematics Benchmarks, Grades K-12
These are from Charles A. Dana Center at The University of Texas at Austin. The benchmarks describe the content and skills necessary for students on any given grade (K-6), or by strands (K-6 and 7-12). You can use these to have an idea of what topics to cover on any grade.

Practice Problems for the California Mathematics Standards Grades 1-8

Free lesson plans for various math projects
From Math Projects Journal.

HSTutorials.net
Free animated and narrated math tutorials - pre-algebra, algebra 1, geometry.

LearnersTV.com
Free video lectures, audio lectures, notes, and ebooks etc. for college level math. Also has material for various sciences.

Algebra 2 Video Lessons Includes online video lessons and other support materials to accompany Holt Algebra 2 textbook. Click on the Homework help, choose a chapter, and then view the lessons.
go.hrw.com/gopages/ma/alg2_07.html

Basic techniques for teaching addition, subtraction, place value, multiplication, and division

Mathematics Illuminated
Mathematics Illuminated is a 13-part, integrated-media resource created for adult learners and high school teachers. The series covers the broad scope of human knowledge through the study of mathematics and its relevance in the world today. It reaches beyond formulas and computations to explore the math of patterns, symmetry, relationships, multiple dimensions, and more, all the while uncovering the secrets and hidden delights of the ever-evolving world of mathematics. This course us videos, online texts, web interactive activities, and group activities.

Here at HomeschoolMath.net you can also find some math teaching tips and lessons.

And definitely check my list of a online math games and tutorials list - it is organized by topic and level.

Contact me if you know of other resources to be added to this list. Comprehensive math curriculum related resources only, please - free or very inexpensive. This page is not meant for worksheet resources, nor for math games, nor for commercial homeschool math curricula.