Search through your cupboards and drawers at home for items with bar codes. Look at different kinds of products such as grocery items, health products, nonfood items, and coupons. Can you find an item that has a 6 or 7 as the first digit of its UPC? Find four bar codes, making sure the first digit of the UPC is different for each bar code you use. Remove the bar code from the product if possible. Paste the bar codes to a piece of paper and carefully identify the four parts of the UPC: the type of item, the manufacturer’s number, the product number, and the check digit. Verify the check digit for each UPC and be sure to show your calculations.
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