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Ducksters

Ducksters: Kids Math: Prime Numbers

For Students 9th - 10th
Math prime numbers for kids to learn about these unique digits.
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National Council of Teachers of Mathematics

The Math Forum: Famous Problems in the History of Mathematics

For Students 9th - 10th
On this site, there are several math problems to explore and solve. Look through some solutions by famous mathematicians and expand your thinking about some interesting math concepts. Teachers of elementary grades may want to use this...
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Shmoop University

Shmoop: Basic Operations: Prime Factorization

For Students 3rd - 8th Standards
Students learn about prime factorization. The resource consists of notes, step-by-step examples, and practice problems with solutions.
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PBS

Pbs Learning Media: Pizza Toppings

For Students 6th - 8th Standards
This Cyberchase video features Bianca who uses Venn Diagrams to make a pizza that satisfies the topping preferences of her friends.