ANSWERS: 4
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A graphing calculator :D Just input the numbers under one of the lists it offers.
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Index cards. You could punch a hole in one corner and put them on a key ring.
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I use my cell phone as a phone book.
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Business cards. I used business cards designed for the printer. I made a cover and inside pages with lines for name, address and phone number. Then I stapled them together. It worked pretty good.
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