Math
- 83
- NASS Kids
- The National Agricultural Statistics Service provides some basic explanations of statistical terms, as well as games and puzzles.
- 84
- The Birthday Problem: A Short Lesson in Probability
- Find out how likely it is that two people in a class have the same birthday. With an explanation of the math behind this problem and a simulation.
- 85
- Activities in Math: Trigonometry
- Three comprehensive modules from Syvum. Each includes theory and explanation, along with practice exercises.
- 86
- An Index of Trigonometry Help Pages
- Provides detailed discussion of trigonometry concepts. Includes examples of varying difficulty.
- 88
- Marlene's Trigonometry Calculator
- Learn the basics, the solutions, and how to convert from degrees to radians.
- 89
- S.O.S. Math - Trigonometry
- Covers measuring degrees, equations, and formulas. Includes illustrations and related links.
- 90
- Trigonometry
- Introduction to trigonometry. Includes links to trig-based animations and definitions.
- 92
- Trogonometry I
- Self-teaching site offered by Doug Simms. Watch instructional videos, then print exercise and answer sheets.
- 93
- Arabic Mathematics: Forgotten Brilliance?
- Explains contributions of Arabian mathematicians by translating early Greek texts, developing early algebraic ideas, number theory and astronomical calculations. Includes information about key people during this time period.
- 95
- Counting to Infinity
- Introduction to infinity including the origins of the sign for infinity and pictures.
- 96
- Egyptian Mathematical Papyri
- Includes a description of each written document, as well as some sample problems from the Rhind, Moscow and other papyri. These ancient written works were created between 1900 and 1800 BC.
- 97
- Famous Problems in the History of Mathematics
- Describes what mathematicians have worked on, from ancient times to the present. Includes problems suitable for middle school and high school math students, with links to solutions.