nrich – Enriching Mathematics – http://nrich.maths.org
NY Times – Wordplay/Numberplay – http://wordplay.blogs.nytimes.com
+plus Magazine – http://plus.maths.org
Society for Industrial and Applied Mathematics – http://www.siam.org
The Museum of Mathematics – http://momath.org
Window Seat – Circles are Awesome – http://windowseat.ca/
Yummy Math – http://www.yummymath.com
I am a strong believer in Flipped Classroom, First 5 Days, Standards-Based Grading, and Thinking Classrooms. All of these have been incorporated into my IB Math and AP Calculus BC classes.
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@mkarnold
For cruciverbalists...A Good Place to Start..
Read All About My Journey and Experiences Here!
I have no idea why I picked this blog name, but there's no turning back now
Lessons, Commentary, Coaching, and all things mathematics.
Learning Mathematics - Resources for Students
Discovering & sharing innovative ways to leverage technology to deepen relationships, build confidence, & create a safe learning environment where every student feels empowered to share their voice
growing up and journeying forward
MY FLIPPED CLASSROOM
blue shirt khaki pants 
Some other sites you might like:
Nancy Powell’s Math and Technology Site – http://NAPmath.wordpress.com
SMARTBoardSmarty, a site with Math Notebook files for SMART boards with additional resources – http://smartboardsmarty.wikispaces.com