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Online math applets and games

National Library of Virtual Manipulatives (NLVM)
Interactive applets organized by grade band and content strand
WisWeb
Freudenthal Institute's website for secondary math education.
Shodor: Interactivate
Interactive applets, activities, and lessons

Math sites for teachers and students

NRICH
"The NRICH Project aims to enrich the mathematical experiences of all learners. ... you will find thousands of our free mathemat
Running the Numbers
Big numbers a la Chris Jordan
Plus magazine
"opens a door to the world of maths, with all its beauty and applications" (UK)
singingbanana's channel on YouTube
Interesting math challenges (UK)
Mathlanding
Find good K-5 online math resources

Math sites for students

Numeracy Hour
From Ambleside Primary School (UK); applets and games to develop "maths" abilities at a range of levels. Designed by students.
A Maths Dictionary for Kids
By Australian Jenny Eather. Interactive, very engaging, and full of good explanations of math terms.
Solve This!
Meet some famous mathematicians, solve some problems, play some games. A Think Quest entry designed by three fifth graders in Br
Math Playground
Oodles of math games for students.

Math sites for teachers

Math teacher blogs

Let's Play Math!
"Math is a game, playing with ideas. This blog is about learning, teaching, and playing around with K-12 mathematics."
Math Mama Writes...
This blog is maintained by Sue VanHattum, " a community college math teacher interested in all levels of math learning, and the
Keeping Math Simple
"contains teaching tips based on current reforms in mathematics education and teaching such as teaching mathematics through prob
Great Maths Teaching Ideas
"Sharing great ideas and resources with maths teachers around the world"
dy/dan
Dan Meyer's blog: "less helpful"
Math for Love
"It's about math, creativity, culture, education, and beauty. It's for everyone."

Sources of good problems

NZMaths
Problems and accompanying lessons from New Zealand, organized by level and strand. Downloadable game applets.
Word Problems For Kids
From St. Francis Xavier University, Nova Scotia; problems for grades 5 through 12, organized by grade.
WASL sample problems
From Port Angeles, WA; organized by grade and strand, K through high school.

Food for Thought - Math

Dan Meyer at TEDxNYED
Math Curriculum Makeover
Math is not linear
Thought-provoking presentation, aimed at HS, but applicable to all
Why parents can't do maths today
From the BBC: alternative algorithms in the UK

General sites for teachers

Classroom climate/management

Gifted Ed

Differentiated Instruction