Khan Academy offers a free self-paced course in math for students in grades K-12 and beyond. It tutors students in everything from basic math skills and number sense to geometry, algebra, trigonometry, and calculus.  The tutorials consist of videos, step-by-step learning  problems, and practice/quiz sessions. While working problems, students can ask for hints and view videos to review the steps to solve them.

There is a coaching section where teachers, tutors, or parents can enroll their kids and monitor their progress.  A pretest helps to determine where each student is skilled and what skills he/she needs to work on next.  A graph displaying each module as not started, in progress, passed or mastered. The graph gives both coaches and students an overall sense of how they are progressing in their math skills.

Khan Academy continues to excel as one of the best free tools available for self-paced math learning, especially for middle and high school students and homeschoolers.

Free registration is required to make use of the monitoring and progression tools.  No registration is required to use the videos and interactives to learn discrete math concepts.  This makes it useful for self-learning, for instance, when a student is absent from class and misses a math lesson teaching a new concept or skill.

Available both online and as an IPhone/iPad app or Android phone app.

For the newest available content, you may also want to subscribe to the Khan Academy channel on YouTube.

Mathopolis has several games for students to practice basic math skills. The Games section encompasses addition, subtraction, estimation, multiplication, division, percentages, length, area, square roots, fractions and decimals.    Mathopolis tracks your highest scores, and shows you how you’re performing compared to other players.

The Questions section provides additional problems and guided practice to help K-8 students master math skills.  The skill sets range from basic numeracy to pre-algebra.  There are daily problems,  mini-courses, and a quiz database searchable by skill set and grade level.

Registration and login is required for competition mode. A nice feature is that you can toggle ads on and off.  A smartphone app version of the site is available for a fee.

Math is Fun provides instructions in math skills for students in grades K-8, up through algebra. This site excels in providing good illustrations of math concepts. You’ll see this particularly in the American and metric units of measure and the geometric objects.

There is also an Illustrated Mathematics Dictionary. This reference provides a definition with a problem that illustrates the term. The dictionary includes many interactives students can manipulate to help them understand concepts. Move the legs on an angle and watch as it changes from acute to obtuse to reflex.

Clear illustrations, explanations and interactives all help to make math learning easier here.

CoolMath.com focuses on higher level math skills typically learned in grades 6-10. There is instruction and practice on prealgebra, algebra, geometry, trigonometry, and money and finance.  For teachers, CoolMath Karen, a college math instructor, provides some of her teaching techniques and games that help kids to understand and stay interested in the classroom.

This site provides instruction, challenges and games for K-5 skills in addition, subtraction, multiplication, division, fractions and decimals.  You’ll also see tips for parents on how to help your kids with math while avoiding meltdowns. For teachers, CoolMath Karen, a college math instructor, provides some of her teaching techniques and games that help kids to understand and stay interested in the classroom.