Concept explainers
Packing balk. Your best friend is about to turn 21 and you want to send him a box full of Ping-Pong balls. You have a square box measuring 12 inches on each side and you wonder how many Ping-Pong balls would fit inside. Suppose you have just enough balls to cover the bottom of the box in a single layer. How could you estimate (he number that would fill the box?
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The Heart of Mathematics: An Invitation to Effective Thinking
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