US Department of Education
Helping Your Child Learn Math: Math on the Go
Parents and children explore math in the world around them in this collection of math activities. Simple, engaging, and fun, these lessons offer learners the opportunity to discover math even when they're "on the go." An excellent...
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Curious math.com: Math Is an Attitude
This site offers numbers tricks to help multiply and divide large numbers mentally. There are also tricks for powers and roots of numbers.