Procedures -- how to find square
roots, do synthetic division, and even divide by 59 in a clever way
Arithmetic for sixth through ninth graders
-- a less rigorous (that is, more practical) lesson on the rules of
arithmetic.
Trigonometric Equivalences build on
these basic math ideas
Hyperbolic Functions are
related to exp(x) and Euler's formula in an interesting way.
Understanding Logarithms and
Exponents