This website is filled with standard-based math activities for the teacher to use in their classroom. Each month the website picks a few of the lesson plans that will fit well into the classroom. They seem like they can be easily adjusted for any grade.
This website provides teachers with many lesson plan ideas that integrate different subjects into math topics. While they are set for high school students, there are some that could be easily fixed to fix middle school students too.
This websites provides lesson plans and games for many math topics. It also provides paper resources on the topics for the teacher to use to encourage the students to discover more information on the math topic.
This website has been created to help the students understand the main concepts of higher level math. It is geared towards older students; however it also covers some elementary math subjects. This website also has some hands on lessons the teachers can use in the classroom.
This resource has plenty of challenging handouts for the kids. I think this website to be used to print out extra worksheets for the students to work on in their free time or if they need something at a higher level than the rest of the class.