Microsoft Mathematics - math help and graphing calc

Microsoft Mathematics 4.0 is a free download from Microsoft. Mathematics 4.0 is a set of math tools for students to use. It helps students learn how to solve equations step by step along with learning the fundemental concepts in pre-algebra, algebra, trigonometry, physics, chemistry and calculus.

It includes a graphing calculator that works just like a handheld calculator. There are also tools for evaluating triangles, converting units, and solving systems of equations.

The layout is similar to the popular handheld graphing calculators. It is easy to use and navigate, and free.

This is a great resource for math and science teachers and students.

Khan Academy - free video lectures on math, science and more.

The Khan Academy is a not-for-profit with the mission of providing a world-class education to anyone, anywhere.

They have tons of videos (over 1800) with lectures on reviews of different topics, including math, science, humanities, test prep and more. The videos are very well done and I share them with my students as a great review or supplemental resource for them.

The site can also just be browsed as each video is listed on the main page. Below you can see a section of the main page, which starts with the search bar and then Algebra. 

NSTA Science Teacher Grab Bag

The NSTA (National Science Teachers Association) has a great resource on their web page, called the Science Teacher's Grab Bag. If you filter by cost "free" it comes up with close to 100 free resources for science teachers. You can also filter by different dollar amounts if you have funds to spend on resources. You do not have to be a member to access this site.

In general, NSTA is a great resource for teachers and I always recommend that science teachers join. Your membership gets you access to more resources, discounts on NSTA publications, and includes a subscription to a journal of your choice.