No teacher is perfect, and every now and then we need some help. The following websites I have collected to help me with content help and lesson planning help.
Mathematics Website:
National Council of Teachers of Mathematics: http://www.nctm.org/
BrainPop: http://www.brainpop.com/
Khan Academy: https://www.khanacademy.org/
DiscoveryEducation: http://www.discoveryeducation.com/teachers/free-lesson-plans/
Assessments:
This website is about proper formative assessment for students that is more than just worksheets. It has ideas for lessons for secondary grades.
http://map.mathshell.org/materials/index.php
This website contains projects for middle school students.
https://middle-school-math-in-texas.wikispaces.com/6th+Grade+Projects
This resource is a lot like the Khan Academy, but it has many more resources. With each of the topics there is a video and a ton of worksheets.
This is a free resource where teachers can make use of the extensive video library and endless supply of printable math worksheets from any computer with access to the web.
http://www.mathmaster.org/worksheet/
This website lists some alternative ways to assess students and gives descriptions of the different methods. Some include: assessing student understanding by promoting student discussion, taking time to observe, involving students in the development of rubrics, interviewing your students, and assigning self-assessments from your students to monitor their progress.