Calculators and UltraConverter
offers interactive converters for distance, area, volume, mass, time, velocity, force, pressure, energy, power, density, flow, luminance, illuminance, temperature, and angles.
http://www.1728.com/ |
curiouser.co.uk
offers paradoxical designs, puzzles, poems, and ideas.
http://www.curiouser.co.uk/ |
Cut the Knot
interactive mathematics miscellany and puzzles.
http://www.cut-the-knot.org/ |
Free Puzzles
offering geometry, logic, math, weight and other categories.
http://www.freepuzzles.com/ |
Math Cats
creative, open-ended math explorations for children. Also includes cat and dog stories.
http://www.mathcats.com/ |
Mathpuzzle.com
celebrates math puzzles and mathematical recreations.
http://www.mathpuzzle.com/ |
Mathwizz
problems and help for K-12, loan and mortgage calculators, and fun links.
http://www.mathwizz.com/ |
QuickMath
free automated service which provides solutions to all sorts of common mathematical problems within a couple of seconds.
http://www.quickmath.com/ |
The Problem Site
provides math problems, brainteasers, and riddles online. These puzzles aid in developing problem solving and lateral thinking skills.
http://www.theproblemsite.com/ |
thrackle.org
dedicated to John Conway's thrackle problem.
http://www.thrackle.org/ |
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