Clock arithmetic and modular arithmetic
http://www.shodor.org/interactivate/discussions/morerem.html
This site gives a nice introduction to modular arithmetic.
http://betterexplained.com/articles/fun-with-modular-arithmetic/
This site is a nice interactive site which deals with arithmetic (mod m). Do not be frightened by the notation, the arithmetic table … See the whole entry
Infinity (from scratch) – slightly humorous, but mathematically correct. (time: 9:42)
The smallest Infinity (time: 9:33)
… See the whole entry
This site introduces the idea of infinite sets:
http://mathforum.org/isaac/problems/cantor1.html
This site introduces the idea that there are different sizes of infinity:
http://www.math.grinnell.edu/~miletijo/museum/infinite.html
A slightly more advanced discussion of sets can be found in the article, “A Crash course in the … See the whole entry