# mathematica

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## MAKE

Hot Topics: mathmonday Math Monday: Introducing the Sonobe Unit There have been numerous installments of Math Monday on origami or kirigami of one mathematical form or another, but today is the first time we've covered a classic workhorse from... Posted by Glen Whitney | Monday March 25th, 2013 12:12 PM Categories: Art & Design , Education | 3 Comments

## MAKE

<img src="http://cdn.makezine.com/make/blogs/blog.makezine.com/upload/2010/06/math_monday/Math_Monday_banner02_600px.jpg" alt="Math_Monday_banner02_600px.jpg" width="599" height="150" /> By Glen Whitney for the Museum of Mathematics <img src="http://makezineblog.files.wordpress.com/2012/07/gcjbjfde.jpg?w=598&#038;h=448" alt="" title="gcjbjfde" width="598" height="448" class="aligncenter size-medium wp-image-231747" />
Algebra is a branch of mathematics concerning the study of structure , relation , and quantity . Elementary algebra is the branch that deals with solving for the operands of arithmetic equations . Modern or abstract algebra has its origins as an abstraction of elementary algebra. Some historians believe that the earliest mathematical research was done by the priest classes of ancient civilizations, such as the Babylonians , to go along with religious rituals. [ 1 ] The origins of algebra can thus be traced back to ancient Babylonian mathematicians roughly four thousand years ago. [ edit ] Etymology

## Trachtenberg system

The Trachtenberg System is a system of rapid mental calculation . The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly.
The Jedi Mind-Trick It's time for another little diversion. Let's look at an easy way to subtract nine. Most people work out that you first subtract 10, then add one. But my brain sometimes gets a bit lost, forgetting to add the right way – not being sure of the answer, needing to re-work the logic.