Number Lab™
Interactive models of numbers and
arithmetic
Copyright © 2010 by Dave Posner, All Rights Reserved.
Dave Posner (dposner@sbcglobal.net)
Number Lab is a collection of virtual laboratories implemented as Java Applets for experimenting with systems that model numbers and arithmetic. The motivating idea behind Number Lab is to introduce elementary school mathematics as a science, i.e. a theory developed to explain observable phenomena. Thus the purpose of Number Lab is to provide observable systems whose explanation entails the development of elementary school arithmetic
Power Point Slides from MAA 2010 San Francisco
Associative Law for Multiplication
Commutative Law for Multiplication