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Gr 1–4—Albee constructs a conversational, matter-of-fact narrative about the many years humans calculated on counting boards, used their fingers, put knots in strings and beads on lines, all for the lack of a—nothing. Until the Babylonians around 300 BCE, there was no such thing as a placeholder for single digits, tens, hundreds, and beyond. It's another 500–700 years before a mathematician in ancient India uses zero not only as a placeholder, bu...Log In or Sign Up to Read More