National Library of Virtual Manipulatives
Math Wizz
AAA Math 
A+Math

Math Playground

LearningPlanet: Math Mayhem

Visual Fractions

Illuminations: School Mathematics

Conversion Tables

Metric Conversions

Cool Math

A Math's Dictionary for Kids

A World of Math Online

Flash cards for multiplication facts

Helping Your Child Learn Math 

A Fractals Unit for Elementary and Middle School Students

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