- Visual Fractions: An On-Line Fraction Tutorial
 - With line and circle illustrations. - What's Special About This Number?
- Offers distinctive facts about hundreds of different numbers from 0 to 9999.
- Fractions
- Features operations on fractions covered in K8 math courses. Each example is accompanied by an explanation, interactive practice, and challenge games.
- RJN's More Digits of Irrational Numbers Page
- On-Line Encyclopedia of Integer Sequences
- Provides a collection of number sequences arranged in lexicographic order.
- Pascal's Triangle
- Learn what it is, how it is formed, and numerous patterns found inside it.
- Numbers
- How to count in several languages.
- Math by OZ
- Quicktime movies that demonstrate various math subjects to make learning easy and fun.
- Secret Lives of Numbers, The
- Empirical study conducted in order to determine the relative popularity of every integer between 0 and one million.
- Fun With Mathematics
- Continued Fractions
- Hexadecimal Headquarters
- Explore the benefits of hexadecimal, or base sixteen, and learn about its advantages over base ten. Find out the current hex time with the hex clock.
- Hands On Fractions
- Offers Progressive Ruling, a hands-on approach to learning and visualising fractions, fractional concepts, and calculations.
- NumberADay
- Features a number a day with comments on that number’s properties. From the Mathematical Association of America.
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