In this *Cyberchase* video segment, Harry responds to a "Get Rich Quick" ad and finds himself selling Cheesy Greeting Cards. Unfortunately, he has trouble selling all of the cards to friends and relatives, so he sets up a stand on the sidewalk. When he uses a calculator to find the total amount of money he has collected, he is happy to learn it is over $250. But when he looks at the stack of unsold cards, he questions his calculation. He decides to check his total using estimation, and he soon realizes he had made an error on his calculator.

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