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10 Easy Arithmetic Tricks

10 Easy Arithmetic Tricks
Technology Math can be terrifying for many people. This list will hopefully improve your general knowledge of mathematical tricks and your speed when you need to do math in your head. 1. We all know the trick when multiplying by ten – add 0 to the end of the number, but did you know there is an equally easy trick for multiplying a two digit number by 11? Take the original number and imagine a space between the two digits (in this example we will use 52: Now add the two numbers together and put them in the middle: That is it – you have the answer: 572. If the numbers in the middle add up to a 2 digit number, just insert the second number and add 1 to the first: 1089 – It works every time. 2. If you need to square a 2 digit number ending in 5, you can do so very easily with this trick. 252 = (2x(2+1)) & 25 2 x 3 = 6 3. Most people memorize the 5 times tables very easily, but when you get in to larger numbers it gets more complex – or does it? 2682 x 5 = (2682 / 2) & 5 or 0 Let’s try another: 4. 5.

K-MODDL & Tutorials & Reuleaux Triangle If an enormously heavy object has to be moved from one spot to another, it may not be practical to move it on wheels. Instead the object is placed on a flat platform that in turn rests on cylindrical rollers (Figure 1). As the platform is pushed forward, the rollers left behind are picked up and put down in front. Is a circle the only curve with constant width? How to construct a Reuleaux triangle To construct a Reuleaux triangle begin with an equilateral triangle of side s, and then replace each side by a circular arc with the other two original sides as radii (Figure 4). The corners of a Reuleaux triangle are the sharpest possible on a curve with constant width. Other symmetrical curves with constant width result if you start with a regular pentagon (or any regular polygon with an odd number of sides) and follow similar procedures. Here is another really surprising method of constructing curves with constant width: Draw as many straight lines as you like, but all mutually intersecting.

SharpBrains Here you can enjoy the Top 25 Brain Teasers, Games & Illusions that SharpBrains readers (primarily adults, but some younger minds too) have enjoyed the most. It is always good to learn more about our brains and to exercise them!. Fun experiments on how our brains and minds work 1. 2. 3. 4. Challenge your attention and memory 5. 6. 7. Optical illusions 8. 9. 10. 11. Language and logic puzzles 12. 13. 14. 15. A few visual workouts 16. 17. 18. Teasing your pattern recognition and thinking 19. 20. 21. 22. Brain teasers for job interviews 23. 24. 25.

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Relplot: equation plotter Relplot constructs high-resolution PostScript or PDF plots of the solutions to equations on two variables. Unlike most other plotters, it can handle general equations and inequations, not just functions, and it can plot multiple equations at once. What can you plot? Multiple equations/formulas separated by commas: ,Logical operators for combining formulas: && & ||Relational operators: = < <= > >=Binary arithmetic ops: + * - / ^ modUnary arithmetic ops: |x| sqrt floor exp ln sin cos tan asin acos atan atan2 sinh cosh tanhBuilt-in variables: x y r thConstants: pi e 2 -.5 1.4e5 .7e01 πUser-defined function applications: f(e1,..., en)User-defined variables: a-z x^3 + y^3 = 3xy, r^2 = 9/2 Some interesting equations to try: Got feedback? Relplot was written by Andrew Myers at Cornell University.

The Ultimate Open Courseware Toolset: 60 Directories, Search Eng Open courseware has expanded to the extent that directories, lists, search engines, archives and Web tools are available free to anyone who chooses to learn through the Internet. The following list contains some individual tools, but on the whole, this list is filled with links to sites and pages that offer more links to even more resources. So, if you’re looking for an open source tool to create a video, go under “tools” below to find two links to sites filled with open source software resources. All links under the categories below are listed in alphabetical order. This alphabetical method of organization also shows that we do not value open courseware project over another. Directories The following directories have done the work for you, discovering various open courseware projects from around the world or that are focused on one specific area of study. Search Engines and Archives Search engines provide a means to find open courseware easily. Web Tools Did you enjoy this article?

The Ultimate List of Free Web-Based Education Resources - eLearners College Accreditation - Regional vs National Accreditation When choosing which school to attend, it's important to find a college or university that is accredited. Accreditation means that a school has been evaluated by education authorities, to ensure it's offering high quality learning opportunities. Time Management for Online Learners Use Time Management Techniques to Enhance How Efficiently and Effectively You Learn Online. How to Request Your Transcripts Are you thinking about transferring schools? How Today's Students Are Paying For College FAQs for Students Studying Healthcare Administration When it comes to the health administration field, there are numerous points of entry. How to Write an A+ Discussion Posting Whether you are a seasoned distance learner or are taking your very first online class, the online class discussion (also known as online bulletin board or message forum) is central to your online learning experience. Have You Considered a Masters Degree? Synchronous vs.

Linear format equations and Math AutoCorrect in Word 2010 - Word - Microsoft... To insert an equation using the keyboard, press ALT+=, and then type the equation. You can insert equation symbols outside a math region by using Math AutoCorrect. For more information, see Use Math AutoCorrect rules outside of math regions check box. In this article Type equations in linear format You can type most equations quickly by using Math AutoCorrect codes. \eqarray(x+1&=2@1+2+3+y&=z@3/x&=6)<space> which resolves to this: Here are some other examples: Note When an example is followed by two consecutive spaces, the first space resolves the typed text into the equation, and the second space builds it up. Microsoft Office uses the linear format described in Unicode Technical Note 28 to build up and display mathematical expressions. Math AutoCorrect symbols Type one of the following codes followed by a delimiting term. Important The codes are case-sensitive. Note For information on inserting a symbol that is not in the chart above, see Insert a symbol or special character.

Google Docs - Digital Inspiration 14 Mar 2014 How to Scrape Google with Google Sheets Learn how to scrape Google pages and extract search results and keyword ranking data using simple ImportXML functions inside Google Spreadsheets. 11 Mar 2014 The Best Add-ons for Google Docs and Sheets Meet some of the most useful add-ons for Google Docs and Sheets. How to Write an Add-on for Google Docs Google Add-ons add new capabilities to Google Docs and Sheets. 15 Mar 2014 Create Mail Merge with Gmail and Google Docs Learn how to create Mail Merge with Gmail and send personalized email messages in bulk. 04 Mar 2014 How to Monitor your Website’s Uptime with Google Docs Learn how to use Google Docs as a free website monitoring tool and receive instant email and SMS text alerts when your website goes down. 12 Mar 2014 How to Sort Gmail Messages by Size Do you want to sort your email messages in Gmail by size? 03 Apr 2014 How to Insert Images in Google Spreadsheets 26 Aug 2013 How to Import Web Data into Google Docs 24 Jan 2014 28 May 2013 18 Jan 2013

Modernizing COBOL Apps: 10 Reasons Why It`s Important - Application Development By Darryl K. Taft | Posted 2011-01-24 Email Print Like the mainframe, COBOL is not dead. In fact, COBOL continues to live and to thrive in various enterprise environments. Modernizing COBOL Apps: 10 Reasons Why It's Important by Darryl K. Darryl K. Whats Special About This Number? What's Special About This Number? If you know a distinctive fact about a number not listed here, please e-mail me. primes graphs digits sums of powers bases combinatorics powers/polygonal Fibonacci geometry repdigits algebra perfect/amicable pandigital matrices divisors games/puzzles 0 is the additive identity . 1 is the multiplicative identity . 2 is the only even prime . 3 is the number of spatial dimensions we live in. 4 is the smallest number of colors sufficient to color all planar maps. 5 is the number of Platonic solids . 6 is the smallest perfect number . 7 is the smallest number of sides of a regular polygon that is not constructible by straightedge and compass. 8 is the largest cube in the Fibonacci sequence . 9 is the maximum number of cubes that are needed to sum to any positive integer . 10 is the base of our number system. 11 is the largest known multiplicative persistence . 12 is the smallest abundant number . 13 is the number of Archimedian solids . 17 is the number of wallpaper groups .

Online Learning: Reaching Out to the Skeptics - Advice - The Chr By Thomas H. Benton Another major study has arrived—this time from the Department of Education confirming that online courses can be at least as effective in achieving measurable learning outcomes as traditional, face-to-face courses. At the same time, a study from the Association of Public and Land-Grant Universities shows that 70 percent of the 10,000 faculty members surveyed believe that online courses are either "inferior" or "somewhat inferior" to traditional ones. That antagonism might alarm anyone who attempts online teaching in response to administrative encouragements; some of your colleagues will regard you with suspicion, and they may even tell students to avoid your courses. Consider the views of Elayne Clift, in "I'll Never Do It Again," an essay she wrote for The Chronicle about online teaching. But my purpose here is not to argue for or against online education per se. It's a lot of work to learn new teaching methods and adapt new technologies. 1. 2. 3. 4. 5. 6. 7.

Oaks Christian School: Home cgi-bin Matrix Solver Solving a linear equation system of up to 20 unknowns. If you need some help please scroll down to the example. If not, fill the 2 boxes below , then click on the "Go" button. Example As an example, let's say you have the following 3 equations to solve for the unknowns x , y , and z : 2x + 3y + 1/3z = 10 3x + 4y + 1z = 17 2y + 7z = 46 To enter the above system into the matrix solver you enter the number "3" into the small box for the number of unknowns/equations. Into the big box for the coefficients you enter the following numbers : 2 3 1/3 1.0e+1 3 4 1 17 0 2 7 46.0 Notice that each row represents one equation. Note, that for the coefficients you may enter either whole numbers ( like 2 ), fractions of whole numbers ( like 1/3 ), numbers with a decimal point ( like 46.0 ), or numbers in scientific notation ( 1.0e+01 which is the same as 10 ). After entering all numbers click on the "Go" button. You may check the solution : Which checks out.

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