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curiousmath :: math is an attitude@import url("themes/PostNuke/style/style.css"); curiousmath math is an attitude Dec 02, 2008 - 06:22 AM Home page :: Downloads :: Web links :: FAQ Search Main Menu HomeResourcesMath TopicsForumSubmit Math ArticleThe Top TenWeb LinksFAQRSS Site FeedDownloads Who's Online There are 85 unlogged users and 0 registered users online.You can log-in or register for a user account here. Sponsored Links
Welcome to CuriousMath.comWant to learn how to quickly square a number that ends in 5? Or how to tell if a number is divisible by 3? Or maybe you'd like to learn how to calculate square roots by hand? That's the kind of fun and fascinating math tricks and trivia you'll find here at CuriousMath.com.
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Clay In Pursuit of Pi Friday, March 14, 2008 - 10:51 AM Posted by clay 7380 Reads  In honor of Pi Day 2008, I thought I would post a little article about the remarkable, infinite, and irrational Pi.
Simple Summation Formula Wednesday, February 27, 2008 - 01:28 PM Posted by Farisnet 10909 Reads  As inspired by Gauss's tale of impressive summation of all integers from 1 to 100, I set out to have a formula that would sum all the numbers between two numbers, inclusive.
Birthday Paradox 2: Finding a person with the same birthday as YOU Thursday, November 16, 2006 - 08:26 PM Posted by ArunChaganty 19938 Reads Clay's article was an excellent, and a very well explained one too. I'd just like to add the bit about the probability of the odds of finding a person with the same birthday as you. Hopefully mine will be as descriptive as his.
In this article, we shall explore some techniques of probability, and 'permutations and combinations'. This is going to be a slightly long article, but is very much educative, and I'll try to cover the entire thing from front to back. You can skip bits if you know them, but for the benefit of those who don't I've included them. I've finally posted a way of doing the question without any of this knowledge, but I still think you should read and understand what I'm trying to explain. The Birthday Paradox Thursday, August 17, 2006 - 11:19 PM Posted by clay 39661 Reads Here's a fun and easy application of probability to show the odds are good that two people in a relatively small group will share the same birthday. Mentally Divide any 2-, 3- or 4-Digit Number by any 1-digit Number with Decimal Precision Friday, June 02, 2006 - 06:20 AM Posted by ScottC 66278 Reads When asked to do division in your head, it's very impressive to be able to carry the answer out to several decimal places. When dividing by a 1-digit number, it's not that difficult, either.
Unique method to find Magic Square of any order Sunday, March 26, 2006 - 06:46 AM Posted by puneet478 26389 Reads This is one of the best methods used to create a magic square of any order. I will start with an example of 3*3 grid to explain the method.
How to Find any Magic Square Saturday, March 11, 2006 - 05:59 PM Posted by ArunChaganty 25079 Reads Two days before my major exam, my friend and I sat down to play with magic squares. Obviously a big mistake, but I actually did the best of all in that particular exam. I think it came from cracking the code for any odd magic square. Checking for Prime Factors Saturday, March 11, 2006 - 05:16 PM Posted by ArunChaganty 22827 Reads This is a rather well known concept (at least where I'm at), but I thought I might as well post it. I proved it yesterday, and so I thought I'd share it with you all.
Sum of all the digits of a Cube Sunday, November 27, 2005 - 09:57 AM Posted by the_desire 31560 Reads The sum of any cube when reduced to a single digit will always be either 1, 8, or 9.
Multiply two 3-digit numbers mentally Monday, July 18, 2005 - 11:44 AM Posted by j2020j0908 98850 Reads The trick I am going to explain is called the cross-multiplication technique... but not the one you know.
The Magic Sum Sunday, June 26, 2005 - 08:13 AM Posted by mathmate 62561 Reads The other day I was strolling in a part of the city where street vendors compete for the tourist dollar. I came across a young lady, felt marker in hand in front of an easel displaying a 6x6 array of numbers. It was a hot day, and it took an effort just to stand among the crowd at the same time understand what she was explaining. Curiosity won over me and here's what I found. Pythagoras Triplets Monday, December 27, 2004 - 06:30 AM Posted by mathmate 51804 Reads You probably know that 32 + 42 = 52. Those three whole numbers, known as "Pythagoras Triplets", satisfy the Pythagoras Theorem, a2 + b2 = c2. Did you know there are many more such whole number triplets? This article shows you one method of finding them. How to extract the 13th root of a 100-digit number in less than twelve seconds Saturday, December 11, 2004 - 03:04 PM Posted by mathmate 45687 Reads You may have heard the recent news of Dr. Gert Mittring, who correctly extracted the 13th root of a 100-digit number in less than 12 seconds...in his head. This article shows you how to accomplish the same feat in the same amount of time using an ordinary calculator. Calculate any number to any power using logarithms Wednesday, December 08, 2004 - 07:21 AM Posted by guil140 62102 Reads With the help of logarithms, you can do some pretty amazing mental calculations. This article shows you how. What is the largest number you can write with just 3 digits? Tuesday, September 07, 2004 - 11:25 AM Posted by capperdisc63 167512 Reads No symbols and characters allowed. (Here's a hint: it's not 999) Perform Logarithms in Your Head Monday, August 09, 2004 - 09:33 PM Posted by flyers2000 46446 Reads I came up with this method for determing the logarithm (base 10) of a number in my head back in 1995. I was tutoring a friend for her MCAT exams and a question involving pH and pKa values struck my interest. Although we were able to arrive at a suitable answer without actually needing a calculation, I still wanted a quick way of determining logarithms in the event that I found myself without a calculator (and just as a mental challenge for myself). Multiplying 3 digits or more by 11 Thursday, February 26, 2004 - 04:01 PM Posted by kayer35 54413 Reads Here's how you can directly write down the answer to any number multiplied by 11.
Multiply Up to 20 X 20 In Your Head Thursday, February 26, 2004 - 03:57 PM Posted by kayer35 86225 Reads Got 5 minutes to spare? That's all the time you need to learn how to quickly multiply two numbers from 11 to 19 in your head. Invention of the Master Monday, December 15, 2003 - 11:02 AM Posted by sancle 54534 Reads Ask anyone to select a number less than 1000, and to divide it respectively by 7, 11, and 13, giving you the three remainders. You will then be able to tell him what number he originally selected. Fun With Squares Tuesday, October 28, 2003 - 03:15 PM Posted by PiInTheFace314 68104 Reads Like they said, it’s hip to be square! Here are a few easy tricks that’ll make squaring numbers much faster.
A Simple Formula For Computing the Sum of All Numbers from F to L Tuesday, September 30, 2003 - 11:58 AM Posted by deud 63762 Reads If you want to add all the numbers from F (First) to L (Last), here is an easy way to do it, and many times can be performed in your head. Possibly simplify calculating a difficult percentage Friday, September 12, 2003 - 09:32 AM Posted by deud 49703 Reads Sometimes a difficult percentage calculation can be made easy simply by swapping the two terms. Classification of Even Numbers Monday, June 09, 2003 - 10:07 AM Posted by clay 42078 Reads The number classification you’re probably most familiar with is odd and even. Even numbers can be divided into two equal parts without a remainder. Odd numbers can’t. End of story, right? Not according to Boethius. He divides even numbers into three types. Curious Calculations Saturday, May 17, 2003 - 09:45 AM Posted by louisflorian 86666 Reads Interesting products for various multiplication problems. Not very useful, but certainly curious. More Multiplication Tricks for the Number 11 Tuesday, April 22, 2003 - 06:58 AM Posted by Einstein323 32210 Reads To multiply any three-digit number that has similar digits (e.g. 333) by eleven, you can apply certain rules. These following rules might be complicated and you might find no use for them, but they're quite interesting.
The Cube Root Trick Friday, March 14, 2003 - 06:08 PM Posted by clay 98839 Reads If someone cubed a two-digit number on a calculator and gave you the result - but not the original number - could you extract the cube root? With this trick, you'll be able to do just that - instantly! Math Word Roots Tuesday, February 11, 2003 - 01:52 PM Posted by clay 67438 Reads Ever wonder where math words come from or how they developed? I do. That's why I put this section together. I know it's a short list but, heck, you wouldn't read it if it was long. Squaring Tricks Tuesday, February 11, 2003 - 01:33 PM Posted by clay 37605 Reads Here are a few recipes for spicing up your squaring excitement. They're not necessarily easy or quick, but I think they're worth knowing if you're into math tricks. How to Calculate Square Roots without a Calculator Tuesday, February 11, 2003 - 01:04 PM Posted by clay 91354 Reads Ever wonder how to determine the square root of a number without the aid of a calculator? Believe it or not, people used to do this. Here's one method for doing so. Scroll Down Slowly Tuesday, February 11, 2003 - 09:06 AM Posted by clay 93820 Reads A friend of mine e-mailed this to me a long time ago. Give it try, it's pretty neat. The rules are simple: just scroll down slowly. 1 – 2 > User's Login User namePassword Remember me Log in Problems? New User? Sign Up! Sponsored Links
Other Stories In Pursuit of Pi (Mar 14, 2008)Simple Summation Formula (Feb 27, 2008)0.999...=1 ? (Nov 23, 2007)Large Special Products Factorization Algorithm (Jun 24, 2007)the golden number (May 22, 2007)Interesting way to Square (May 22, 2007)A Simple Number Trick (May 22, 2007)A Tip for the SAT Math (May 22, 2007)Magic square for any digit (May 22, 2007)Birthday Paradox 2: Finding a person with the same birthday as YOU (Nov 16, 2006) PostNuke :: PostNuke support :: PostNuke NOC    All logos and trademarks in this site are property of their respective owner. The comments are property of their posters, all the rest © 2007 by meThis web site was made with PostNuke, a web portal system written in PHP. PostNuke is Free Software released under the GNU/GPL license.
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