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[Grade 3 Chapter 3 Math World]

Addition and Subtraction Around the World

Internet Links

Following are links to Internet resources that can be used to support instruction of the Math World feature for this chapter.

Calculating Machines
Created by computer engineer and collector Erez Kaplan, this site explains and displays a variety of adding and calculating machines and the developmental history of calculating machines. You may wish to start your exploration by clicking the Classification and pictorial view link.
http://www.webcom.com/calc/

Earliest Uses of Symbols of Operation
This site provides details about the earliest uses of mathematical symbols. The information was collected by Jeff Miller, a Florida high school teacher.
http://members.aol.com/jeff570/operation.html

Early Calculators
This Web page, part of the online Museum of HP Calculators, explains and provides pictures of several early adding machines. The most recent calculators represented were introduced in the 1960s.
http://www.hpmuseum.org/prehp.htm


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