1. Khan Academy - www.khanacademy.org
Khan Academy is a site which features hundreds of ad-free videos for the purpose of free education. The videos originally started out as math help in advanced subjects, but now span across many different domains. In addition, the videos now contain help for a wider range of mathematics starting at earlier ages.
2. Desmos - www.desmos.com
Desmos is a simple online graphing calculator. However, it's incredibly intuitive to use, and allows for quick graphing of equations. In addition, it allows students to quickly change variables using sliders. As an added bonus, there are two accompanying websites for teachers and students, which features different math games and tutorials: www.teacher.desmos.com, www.student.desmos.com
3. Wolfram Alpha - www.wolframalpha.com
Wolfram Alpha is known as an information database. It features a simple search bar similar to Google, but rather than providing search results, Wolfram Alpha returns information. For instance, it acts as an incredibly powerful calculator if you type a math problem in. Or if you type in the name of a food, all of the nutrition information is listed. The applications of this tool are endless.
4. National Council of Teachers of Mathematics - www.nctm.org
The National Council of Teachers of Mathematics (NCTM) website contains a lot of very useful information on teaching mathematics. In addition, NCTM also publishes a journal with many different topics on teaching various math concepts. There is also information on annual conferences across the US which teachers can attend to push their teaching practices forward.
5. Dan Meyer Blog - blog.mrmeyer.com
Dan Meyer is a former mathematics teacher who was made popular through a TED talk with several million views. His views on education are wonderful, and he offers a lot of practical advice and problems for teachers to give their students. He now works at Desmos.
6. Common Core Math Standards - http://www.corestandards.org/Math/
This is the official website featuring the Common Core Standards for mathematics in the US. Teachers, parents, and students can look at each of the individual standards for each grade by navigating the menu along the right hand side of the page. This is a tremendous resource for teachers who need help determining exactly what topics students should know at the beginning and end of a school year.
1. Coursera - www.coursera.org
Coursera is a website which features hundreds of different online classes. All of the classes can be taken for free, or learners can choose to pay for an optional certificate upon completion of the course.
2. edX - www.edx.org
Similar to Coursera, edX also features hundreds of different online courses. However, edX was originally started by MIT and has particularly useful math and computer science courses for individuals who want to improve their own skills. There is also a special program offered through edX on teaching through technology.
3. Udacity - www.udacity.com
Udacity is another website featuring online courses -- however, they have a focus on Udacity Nanodegrees. Students can learn anything from programming to building Virtual Reality (VR) games to designing the software behind a self-driving car! The courses are all very interested and well-taught through the Udacity instructors, however the price for the Nanodegree programs can add up.
4. Udemy - www.udemy.com
Udemy is a site similar to Coursera and edX, offering hundreds of different courses for helping students learn more specific skills. However, the instructors on Udemy are generally individuals who are paid commission for teaching on the site. This means that the variety of courses goes more in-depth to a single topic, however it can also mean less quality control in the instruction.