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**Cross Sums**(www.pro.or.jp)

Play cross sums online. A cross sum is like a mathematical crossword puzzle. You have to make the different parts of the puzzle add up to a given value.**Interactive Mathematics Miscellany and Puzzles**(www.cut-the-knot.org)

Cut-The-Knot is a massive site by Alexander Bogomolny with essays puzzles and mathematics.**Descriptive Mathematics**(descmath.com)

A site conerned with the liberal arts aspects of mathematics. It contains a discussion of rich theory, calculus and other topics.**Online Math Education**(www.math10.com)

Site about education in mathematics where you can find many math formulas and ask the teacher.**Homeschool Math**(www.homeschoolmath.net)

HomeschoolMath.net is a comprehensive math resource site for homeschooling parents and teachers**Planet Math**(planetmath.org)

PlanetMath is a virtual community which aims to help make mathematical knowledge more accessible.**Math is Fun**(www.mathsisfun.com)

Math is Fun has pages on interesting aspects of mathematics.**mecmath**(www.mecmath.net)

Site has an open sourced book on Vector calculus.**Pi Day**(www.piday.org)

3.14 is pi day.**DadsWorksheets.com**(www.dadsworksheets.com)

Dad's Worksheets offers a selection of printable math worksheets.**Cymath**(www.cymath.com)

Cymath is an online math problem solver.

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