An integer (greater than one) is prime if the only whole numbers it can be divided by (without a remainder) are itself and one. All other integers are composite. In other words, a prime number has only two positive factors. Composite numbers have more. Fo
Eratosthenses was a Greek mathematician who figured out that to find all the prime numbers between two and some large number, you need to remove all the multiples of each number between two and your large number.
"A prime number is a positive integer that has exactly two positive integer factors, 1 and itself.
Fact Monster begins with a short prime number lesson, and a table of all the prime numbers between 1 and 1000.
For middle school and high school students, this Math Forum goes behind simple prime number definition, and introduces both Euclid's theory of prime numbers (which has been proven) and Goldbach's Conjecture (which hasn't.
Our last site of the day is the most comprehensive.
Leonardo Fibonacci, sometimes called Leonardo of Pisa, was a thirteenth-century Italian mathematician. He was instrumental in bringing the Arabic numbering system to Europe to replace the use of Roman numerals. He is also remembered for a series of number
Cynthia Conner created her Fibonacci website as a project for a class in teaching elementary math.
My Fibonacci pick of the week belongs to Dr.
"Please tell me about the Golden Ratio (or Golden Mean), the Golden Rectangle, and the relation between the Fibonacci Sequence and the Golden Ratio.
From the pages of Plus Magazine, this one-page article is a synopsis of Dr.
Created for the 1999 ThinkQuest competition, this Fibonacci site was built by three high school students.
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