Counting T-Shirts
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Learn to count! Count the T-shirts by making the circle bigger or by moving the T-shirts in and out of the circle. The number in the center of the circle tells you how many are inside it.
Contributed by: Michael Schreiber (March 2011)
Open content licensed under CC BY-NC-SA
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"Counting T-Shirts"
http://demonstrations.wolfram.com/CountingTShirts/
Wolfram Demonstrations Project
Published: March 7 2011