Visualizing Simple Addition and Multiplication

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One of the elements of the National Council of Teachers of Mathematics (NCTM) number and operations standard for grades pre-K-2 is that students be able to "understand the effects of adding...whole numbers...". This Demonstration allows students (and their teachers) to explore whole number addition and multiplication on a hundred board.
Contributed by: Chris Boucher (March 2011)
Open content licensed under CC BY-NC-SA
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"Visualizing Simple Addition and Multiplication"
http://demonstrations.wolfram.com/VisualizingSimpleAdditionAndMultiplication/
Wolfram Demonstrations Project
Published: March 7 2011