Calculators
and other arcane math related matters

1. Here's a full-function RPN calculator: http://www.cohort.com/CoCalc.html.  It is interesting that this calculator (and GraphApplet, below) can be downloaded to your machine and used even when you are not connected to the internet.
2. If you are looking for a collection of capable Java calculators, try here: http://www.joma.org/.  See the Mathlets section.
3. Are you interested in adding your machine to a network of machines that together represent a prodigious amount of computing power? For example, you could become part of the Great Internet Mersenne Prime Search (GIMPS). Or you could make history by using a program on your computer as a screen saver that hunts for Fermat Number Divisors.
4. A weekly ezine about what's happening in Math, Engineering and Technology.
5.  "Plus" is an internet magazine which aims to introduce readers to the beauty and the practical applications of mathematics. It is published in conjunction
 Math puzzler.

 1) Key-in the first 3 digits of your phone
 number into a calculator  (not  the area code)
 2) Multiply by 80
 3) Add 1
 4) Multiply by 250
 5) Plus last four digit of phone number
 6) Plus last four digit of phone number again
 7) Minus 250
 8) Divide by 2

 Is it your phone number?
 

 with the Cambridge-based Millennium Mathematics Project.
6. Terrific article on Prime Numbers. Amazing illustrations of the distribution of primes.
7. Fractal of the Day Weird.  An endless sequence of fractals (you may have to use crtl-alt-del to free yourself from this one).   More fractals.  * Fractals and other stuff (instructional).  Even more fractals.
8. Compute the dates of the start and end of daylight savings time.
9. An Encyclopedia of Integer Sequences. Fascinating what a sequence may be related to. (See the "Hints" page.)
10. Riddles
11. Tracks thousands of satellites.
12. Mathchallenge Math puzzles and challenges. Of particular interest is the Euler Project which combines mathematical and programming challenges.
13. A math puzzle. ("guesses" the number you left out every time)
14. Mathworld. A comprehensive and interactive mathematics encyclopedia.
15. Geometry In Motion.
16. Calculus Derivatives. Integrals. Matricies. By Mathematica.
17. BODMAS Doing calculations in the right order.
18. Conversions. Metric to inches. Kilos to pounds. Money units. etc.
19. Calculator(s)
20. Many, many calculators. Odds on anything.
21. Weekly Calculus Problem New problem each week, and answer to previous week's problem. High school level. New
22. Roman Numerals New
23. GNUplot Command-line function plotter, 2D and 3D. New
24. The best Periodic Table you have ever seen.
25. http://maanumberaday.blogspot.com/ A number a day, with properties. What's in a number?

An alumnus, Steve Wiemar '75, co-directs the Math Forum about on-line learning

111,111,111 multiplied by 111,111,111 equals 12,345,678,987,654,321

"Black holes are where God divided by zero" -- Albert Einstein

Scientific calculator for chemists with notebook is a fully functioning JavaScript calculator. This calculator can be used as common scientific calculator (sin, cos, log, power, root, memory), but it also includes a molecular weight calculator and the tables with various physical and chemical constants. The calculator contains a list with task history, storing all the recent inputs and results. Scientific calculator displays the numbers rounded to a user-specified number of decimal places.

Calculus Toolkit. Factoring, integration, derivatives, graphing, ...  That is, access to several functions.
Mathlets. About 40 Java Applets to calculate just about anything.
Why stop now. Mathtools.net

Solve all sorts of math problems online: QuickMath

GraphApplet 1.0

A very comprehensive Java calculator.

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