These online resources were selected as examples of sites that are available online for educators to use to find lesson ideas, online projects, movie clips, and/or interactive games/activities to use to help make the mathematical content real.

4Teachers.Org
Most of these resources are free. Since they are grant-driven, some are now subscription-based. But you can create rubrics, online quizzes, tracks (which are a list of websites that you can use in a lesson or for professional development), and online calendars.

California K-12 High Speed Network
This site is free to teachers who have an email address from a district. Places to share files and load podcasts.

Conceptua Math
Free, online tools for fractions instruction. These flexible fractions tools allow students to develop conceptual understanding, procedural strength and higher order thinking skills in this fundamental mathematics topic. Great for use on interactive whiteboards for whole-class instruction. Tools include fraction circles, horizontal and vertical bars, area model, dots (discrete), number line, benchmark fractions, unitizing with pattern blocks and more.

Dr. Math - the Math Forum
This is the site was created to help students (and teachers) find the answers to math problems.

LBUSD-Curriculum: Mathematics: Teacher Resources
Long Beach Unified School District has a wonderful collection of PDFs that you can adapt for your own classroom. It is also good resource for math cognates to print out and has a pdf of math terms in other languages.

Math Circles
Mathematical Circles are a form of education enrichment and outreach that bring mathematicians and mathematical scientists into direct contact with pre-college students. These students, and sometimes their teachers, meet with mathematical professionals in an informal setting, after school or on weekends, to work on interesting problems or topics in mathematics. The goal is to get the students excited about the mathematics, giving them a setting that encourages them to become passionate about mathematics.

Mathematics in Movies 
This site from Harvard has video clips of movies that have a math connections. Some are actual video clips, others might be a screen shot of a person standing in front of a blackboard that has an equation on it.

mrcoley.com
Mr. Coley is a 5th grade classroom teacher who has created videos of math lessons and other resources.

NCTM Illuminations
Illuminations is designed to provide standards-based (online) resources that improve the teaching and learning of mathematics for all students. Provide materials that illuminate the vision for school mathematics set forth in Principles and Standards for School Mathematics.

National Library of Virtual Manipulatives
This site has an easy matrix to help you narrow your search for the virtual manipulatives or activities you might be able to use in your lesson.

NRICH Home Page
This is the portal for this wonderful site from Cambridge University with interactive sites in many math topics. This project has problems, articles and games for teachers and students.

Oswego City School District - Regent Exam Prep Center
This site is a resource teachers for assessment ideas and is a place to refer middle school and high school students to for additional help.

Teachers' Domain
Teachers' Domain is an extensive library of free digital resources from public television and other leading media producers, designed for classroom use and professional development.

TeacherTube
This is a site that hosts online videos for teachers (by teachers). There are ads on the pages, but some of the moves are quite interesting and engaging. Search through the video clips to help math more entertaining or to get ideas from other teachers on how to teach a lesson.

National Library of Virtual Manipulatives
This site has an easy matrix to help you narrow your search for the virtual manipulatives or activities you might be able to use in your lesson.