Concept explainers
UPC your friends. Have a friend find a product that has a 12-digit UPC. Ask your friend to carefully read aloud the digits but to skip one digit and say “blank” in its place. Figure out the missing digit. Do this with several different products if you wish. Explain to your friend how you did it. Record the UPCs, the missing digit, and your friend’s reactions.
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EBK THE HEART OF MATHEMATICS: AN INVITA
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