The Numeroscope is a multi-media, interactive laboratory for exploring number systems that form the basis for mathematical cryptography. It uses exotic number systems to illuminate the meaning of familiar algebraic operations such as +, -, x, /, sqrt, and log.
The modules offer lab activities and discussion topics:
- Addition and Multiples: When counting 'wraps around' - Multiplication, Powers, and Logarithms: How clock numbers behave under multiplication; a discrete logarithm problem - Factoring - Coiling up Clock Numbers; factoring out the influence of primes - Applications to Cryptography (RSA): The multiplicative structure of clocks with pq hours (p,q prime) - "Donut" Numbers - The Square Root: clock numbers and 'imaginary' roots - Galois Numbers - Solving Polynomial Equations: creating larger number systems by imagining solutions to more complicated polynomial equations
You will need a Java-capable browser to use the Numeroscope.
Practice questions for the Ohio ninth grade proficiency test from the Information Infrastructure Technology and Applications (IITA) K-12 Program of the NASA Lewis Research Center in Cleveland, Ohio. Thirty nine questions help build skills in addition, multiplication, problem-solving, and algebra. Explanations why possible answers are correct or incorrect are included, and a question that tests comprehension of basic concepts follows each incorrect answer.
In addition to a Teacher's Resource Center, this site also features a Wind Tunnel Aeronautics Activities project that offers experiments and lesson plans designed to help explain some of the basic principles of aeronautics. Answers to problems and Space Mathematics Worksheets are included.
As a virtual center for mathematics on the Internet, the Math Forum strives to be an international site. We know that not all our users are native speakers of English, so our Internet Resource Collection includes pages of math resources in languages other than English. You can find them by using our searcher to look for French or German or Spanish: