HippoCampus
Online interactive lessons (free) covering high school algebra and calculus courses (including AP calculus).
www.hippocampus.org
MathMistakes.info
Common student mistakes in algebra, trig, and calculus explained.
mathmistakes.info
Quickmath
Online calculator that automatically provides solutions to algebra problems and equations.
www.quickmath.com
ECalc
An excellent online calculator. Both basic and scientific forms. Features include complex numbers math, unit conversion, expression history, linear and root equation solvers, and more. Also available as a desktop application. See also their math reference sheets
www.ecalc.com
Webmath.com
Are you stuck on a math problem? Instant-answer problem solvers, huge amount of already solved example problems, or ask an expert.
www.webmath.com
Online tutoring
TutorsVille
Online tutoring - tutors for any subject. Pricing $29.99 for two hours; trial lessons are also available for $9 per hour (money back guarantee).
www.tutorsville.net
Teacher4U
A virtual math lab for pre-algebra, algebra, and geometry that consists of multimedia lessons using a step-by-step approach. The cost is between $1.00 and $3.00 per lesson. Private tutoring also available.
www.teacher4-u.com
Tutor Bungalow
A free home tutoring marketplace. Tutors post profiles for free and students contact them directly for free. Limited revenue is generated from the sale of featured listings for certain tutors. The website has a very clean, user-friendly layout.
www.tutorbungalow.com
TutorSpree
A marketplace for high-quality tutoring. The tutors at TutorSpree are all educators.
http://www.tutorspree.com
Next Guru
An online marketplace that allows students to browse private tutor profiles for over 90 subject areas.
www.nextguru.com
MathLessons.com
Find a math tutor in your area. Listings by country, state, and city.
www.mathlessons.com
Math Tutor Online
Octavian tutors middle and high school math, concentrating on principles, and not just calculations & algorithms. First lesson free.
www.math-tutor-online.net
Parliament Tutors
Private, In-home SAT Prep to LSAT Prep in New York, New Jersey, Cleveland, Miami and Los Angeles.
www.parliamenttutors.com
SchoolTrainer
Academic coaching (tutoring) for $24.99 per session.
www.schooltrainer.com
CalcTutor
Interactive online tutoring in calculus. The first session is free; after that the price is $17.50 per session. Sessions usually last between 45 minutes and 90 minutes depending on the needs of the student.
www.calctutor.ca
St. Louis Tutoring
Private In-Home Tutoring Services in St. Louis.
stlouis.varsitytutors.com
TutorVista
Online tutoring done using an interactive whiteboard with chat. Also offering SAT/ACT test prep services.
www.tutorvista.com
Math in a Box
Professional, certified math teacher Susan Johnsey offers online tutoring, online classes, and free advice.
www.mathinabox.com
TutorMatch.com
Searchable directory of thousands of tutors around the world. Searching is free but the tutors won't be.
www.tutormatch.com
David Roth Tutor and Homework Help
Tutoring or homework help. Homework help via email: $15/hour. Online tutoring via chat: $20 per hour.
www.tutor-homework.com
WyZAnt Math Tutors
A nationwide tutor-student matching service. Search for local in-home math tutors in your area.
www.wyzant.com/Math_tutors.aspx
Open Door Math Online Tutoring
An online math tutoring service. All instruction is carried out by one qualified, experienced, Canadian educator. Base price $30 per hour.
sites.google.com/site/emathhelp
Maths Tutor by iTutorMaths
Online GCSE courses where the child works with a maths tutor either in weekly sessions, or more often in a "crammer" course.
www.itutormaths.co.uk