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phet Scientific Simulations This is a free site that has scientific simulations for learning math, physics, chemistry, and other science.  The simulations lets you see in a lab format so you can learn principles by observing. Most of these are animated games which may show something like a water filling up a tank or trajectories.  Regarding math there are the following principles: Curve fitting Graphing Area Balancing Fractions Linear regression This is a good way to learn math and is very helpful to show students what is happening as opposed to just seeing formulas. This is appropriate for: Grade school students Middle and junior high students High school students College students 
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My Math Forum Post your question and get an answer or if you are like me you can go to the site to answer questions.  This is a pretty decent site to correspond with others on how to solve problems.  This forum has a lot of posts and appears to have a lot of teachers as well as professors.   This is a great site to get your problem solved.    The forum covers these subjects: Arithmetic Algebra Abstract Algebra Geometry Precalculus Trigonometry Real analysis Topology Probability and statistics Linear algebra Calculus This is appropriate for: Math 3 through 6th grade students Middle and Junior high school students High School students College students Professionals Life long learners
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Free Math Help Forum Post your question and get an answer or if you are like me you can go to the site to answer questions.  This is a pretty decent site to correspond with others on how to solve problems.  This forum has a lot of posts and a lot of responses to questions.  This is a good site to ask questions and if you like to answer questions this is great too.  There are many problems posted so you may be able to find one that is similar to yours.  The forum covers these subjects: Arithmetic Algebra Geometry Precalculus Trigonometry Probability and statistics Linear lgebra Calculus Advanced math Math Odds and ends This is appropriate for: Math 3 through 6th grade students Middle and Junior high school students High School students College students Professionals Life long learners
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Math 10 Math Forum Post your question and get an answer or if you are like me you can go to the site to answer questions.  This is a pretty decent site to correspond with others on how to solve problems.  Besides forums, this site has practice tests and also has problems and solutions.  I did notice that some of the problems go a long time without being solved but there are a large variety of problems and this is a worthy site.  The forum covers these subjects: Algebra Geometry Precalculus Trigonometry Probability and statistics Linear Algebra Calculus Differential equations Physics Computer algorithms This is appropriate for: Math 3 through 6th grade students Middle and Junior high school students High School students College students Professionals Life long learners
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Mathway Math Calculator This is a great free calculator that does these types of problems: Basic math Pre-algebra Algebra Trigonometry Precalculus Calculus Statistics Finite math Statistics Linear algebra This has a very nice keyboard for entering the problems and is intuitive.  You type in the equations as you would solve it.     Some harder problems like ∫dx/(x⁶+1) or solving higher order polynomials cant be solved with this calculator but this calculator will do most problems.  This is great for checking answers and will show steps if you sign up on Facebook. This is recommended for: Primary school students Secondary school students College students Adults
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Hooda Math Games This is a fun site for kids.  This has a hundreds of different math games that will help student's understand and learn math. There are speed math games that involve multiplication addition subtraction and division.  These are great games for learning tables and will help a student develop skills especially in multiplication.  This site has a timed test for 2 number multiplication and addition problems.  Even as an adult, I enjoy playing the games.   There are games for: Geometry  Algebra Number theory Fractions There are also many games for subjects like physics and reading. Most games are for people up to the age of 12 
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Integral-calculator Integral calculator is a good site with a very powerful calculator for integrals.  I like the format of to enter the numbers.  The steps are a bit cumbersome but it is a great site for solving your integrals. This site is appropriate for: High school calculus students College calculus students Professionals
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