With the Human Calculator, to enter the number 300 million, type 3 hundred million, to divide that by 7 billion, then type 7 billion = The result shown, 4.29 hundredths, is about the fraction of the worlds population that lives in the United States. The rest of us who might still, from time to time, have to work with very big or very small numbers, if only just to understand the world. The non-scientists who havent used scientific notation since high school. The Human Calculator is a calculator for the rest of us.
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