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X-Number World

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Visit this site: http://www.dotpoint.com/xnumber/

Author:James Redin
Description: With the Extended Numerical Keyboards with Structured Data-Entry Capability method, enter a number in the same way as you think on the number; for example, input one million and fifty-seven with the four keystrokes 1, million, 5, and 7, in that order. Try the X-Number method of entering numbers by using their oral expression, which handles place value in a natural sense. Also, experiment with several online calculators, read about and see pictures of vintage calculators (mechanical adding machines, troncets, electronic calculators), post to a forum dedicated to vintage calculators, read a brief analysis of Reverse Polish Notation (RPN) against Direct Algebraic Logic (DAL), or use online Java or JavaScript calculators. With a Brief History of Mechanical Calculators.

Levels: Elementary, Middle School (6-8), High School (9-12)
Languages: English
Resource Types: Graphics, Calculators, Discussion Archives, Web-Based Discussions, Link Listings, Preprints, General Software Miscellaneous, Web Interactive/Java
Math Topics: Number Sense/About Numbers, Communicating Math, History and Biography
Math Ed Topics: Calculators

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