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21st Century Problem Solving
( http://www2.hawaii.edu/suremath/home1.html )

A site "dedicated to promoting problem solving literacy".

Mathematic Problems and Warm-ups
( http://www.geom.umn.edu/~lori/mathed/problems/ )

A collections of interesting problems.

Web Math Problems
( http://www.cat.cc.md.us/~nghosh/ashby.html )

Another collection.

Math Problems
( http://osf1.gmu.edu/~imedvede/math.html )

More problems.

Interactive Tools for Mathematical Investigations
( http://illuminations.nctm.org/tools/index.html )

An NCTM resource with its Illuminations web site.

                             (http://illuminations.nctm.org)